Cambridge C1 Vocabulary List: Collocations, Phrasal Verbs, and Word Families

A Cambridge C1 vocabulary list is most useful when it tells you more than what a word means. At this level, you need to know which words naturally appear together, which particle completes a verb, which member of a word family fits the grammar, and where a sophisticated-looking choice makes the sentence less precise.

Consider three gaps:

The figures ______ out the committee's concern.

The report makes a compelling ______ for extending the trial.

The wording is open to several interpretations; its ______ is a serious weakness.

Knowing bear, case, and ambiguity separately is not enough. You need the patterns bear out a concern, make a compelling case for, and the family change ambiguous → ambiguity.

Cambridge says Reading and Use of English Part 1 tests idioms, collocations, shades of meaning, phrasal verbs, and fixed phrases. Parts 2–4 also require control of grammar, word formation, and meaning across transformations. The list below is therefore organized by the lexical decision you make, not by an invented set of “official C1 words.” For more targeted practice, use the Cambridge C1/C2 vocabulary hub and browse the wider Exam English hub.

A compact Cambridge C1 vocabulary list

This is a practice set, not a prediction of which words will appear. Its value lies in the reusable decisions it trains.

1. Learn collocations as complete choices

A collocation is not a decorative pairing. It restricts what a word can naturally do.

Make a compelling case for

The useful frame is:

make/build/present a compelling case for + noun or -ing

“The author makes a compelling case for preserving the building, particularly through the evidence on repair costs.”

The final phrase matters. Without the evidence, compelling can become empty praise. It evaluates persuasive force, not truth. A dramatic case may be compelling but flawed; a valid argument may be correct but poorly presented.

Do not write a compelling case of extending. Use a case for extending or a case that the trial should be extended.

One caveat is that

Use caveat when the main point remains useful but has one named limit:

“The survey suggests strong demand. One caveat is that responses came mainly from existing customers.”

This is different from spreading uncertainty across the entire paragraph with maybe, perhaps, and possibly. A caveat is concrete. It tells the reader exactly where the claim stops.

Natural patterns include add a caveat, with the caveat that, and one important caveat. The word does not mean a contradiction or the withdrawal of your conclusion.

The most salient point

Use salient to identify what deserves attention in the present argument:

“The most salient difference is not the total cost but the length of the guarantee.”

The sentence states why that detail matters. Calling every major fact salient weakens the word. Something can be numerically largest without being the most salient feature for the question you are answering.

2. Control the whole phrasal verb

Part 1 can test whether a particle completes a natural expression. Part 4 can test whether you preserve meaning while changing structure. In both cases, learn the verb as a unit.

Bear out

Bear out means that evidence supports or confirms a claim:

“Attendance records bear out the director's claim that evening events attract a different audience.”

The subject is normally evidence, results, figures, experience, or later events. A person does not simply bear out an opinion by repeating it. The evidence has to provide support.

Compare:

• The interviews shed light on why attendance fell: they improve understanding.
• The figures bear out the explanation: they provide confirming support.
• The report illustrates the problem: it gives an example, which may not confirm the full claim.

Boil down to

Boil down to identifies the core after less important detail is removed:

“The two proposals differ in several ways, but the choice boils down to speed versus long-term cost.”

The pattern is X boils down to Y. Do not use it when you are about to give a long inventory. It promises compression. It also differs from rule out, which removes an option from consideration: The evidence rules out a technical failure. One phrase summarizes the issue; the other excludes a possibility.

3. Treat fixed phrases as meaning units

Middle ground is a position between competing demands. Use find, seek, or reach when people are actively negotiating. Use offer, occupy, or represent when a proposal or policy already holds that position:

“A limited weekend service offers middle ground between closing the route and operating it every day.”

The sentence names both ends and the actual compromise. We need middle ground is grammatical but underdeveloped. Implement middle ground is not a natural default pattern.

Do not confuse it with common ground, which is something the sides already share, or a gray area, where a rule or category is unclear. In Speaking, middle ground can move a collaborative discussion forward. In Writing, it can name a balanced recommendation—but only when the position is concrete.

4. Build word families around grammar

A word-formation answer must fit the sentence grammatically and semantically. Memorizing a chain of forms without a sentence frame is inefficient.

Compel, compelling, and compelled

• compel + object + to-infinitive: The shortage compelled the council to revise the plan.
• compelling + noun: The report offers compelling evidence.
• feel/be compelled to + verb: The chair felt compelled to respond.

I felt compelling to respond reverses the roles. Compelling describes what exerts force or persuasive pull; compelled describes the person or organization moved or forced to act. Neither means compulsory: Attendance is compulsory, not attendance is compelling.

Ambiguous, ambiguity, and unambiguously

• adjective: The final instruction is ambiguous.
• noun: The ambiguity lies in the word “recent.”
• adverb: The revised instruction states unambiguously that all receipts are required.

The core meaning remains “open to more than one interpretation.” If a sentence is merely short or missing useful detail but has only one possible reading, incomplete or underspecified may be more exact.

Provisional and provisionally

Use provisional for a real interim status awaiting confirmation:

“The committee gave provisional approval, subject to a final safety review.”

“The venue has been provisionally booked until the deposit is received.”

Use the adverb before a participle or verb: provisionally approved, provisionally scheduled. Avoid provisional on the review. Prefer provisional, pending the review or subject to the review.

Tentative is nearby, but it more often emphasizes uncertainty or weak commitment: Our tentative suggestion is Tuesday. A provisional booking can already exist as a working arrangement even though one confirming step remains.

A three-pass study method

Pass 1: retrieve the frame

Hide the example column in the table and complete these stems aloud:

• make a compelling case ___;
• bear ___ the claim;
• boil ___ ___ one question;
• find middle ground ___ closure ___ full operation;
• provisionally approved, pending ___ .

Pass 2: test the boundary

For each expression, write one sentence in which a near-word would change the meaning. For example:

“The results are ambiguous because the instruction supports two readings.”

Now contrast it with:

“The results are inconclusive because neither explanation has enough support.”

The first concerns interpretation; the second concerns what conclusion the evidence supports.

Pass 3: change the form

Transform one sentence without changing its central meaning:

“The evidence is compelling, so the panel must reconsider.”

“The evidence compels the panel to reconsider.”

Then identify what changed. The first evaluates persuasive force. The second states stronger pressure or necessity. A transformation is not successful merely because it is grammatical; its strength must still fit the original.

Quick check

1. The later data support the researcher's initial claim. Which completion fits?

A. bear the claim up B. bear out the claim C. boil the claim out

2. A booking exists, but confirmation depends on a deposit. Which sentence is most precise?

A. “The booking is provisional, pending the deposit.” B. “The booking is ambiguous with the deposit.” C. “The booking is compelling until the deposit.”

3. Which sentence controls the word family correctly?

A. “The figures are compelled, so I felt compelling to agree.” B. “The figures are compelling, so I felt compelled to reconsider.” C. “The figures are compulsory, so the argument is compelled.”

Answers: 1-B, 2-A, 3-B. Evidence can bear out a claim. A real working booking awaiting one step is provisional. Compelling figures exert persuasive force; a person may feel compelled to act.

Practice prompt

Write a 120-word proposal paragraph about extending library opening hours. Include make a compelling case for, one caveat is that, and bear out. Finish with a concrete middle-ground recommendation. Then underline one adjective, one noun, and one adverb from the same word family and check that each form fits its grammatical position.

To practise retrieving advanced vocabulary in context, try Lyra Practice.

Sources

• C1 Advanced exam format — Cambridge English
• C1 Advanced preparation resources — Cambridge English

Related

• Cambridge C1 Part 1: Collocations and Shades of Meaning
• Cambridge C1 Open Cloze: One-Word Grammar and Phrases
• Cambridge C1 Word Formation: Build the Right Form
• Cambridge C1 Key Word Transformations: Keep the Meaning
• Cambridge C1 Advanced Vocabulary: Natural, Not Textbook

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