Commitment vs Vow

When to use each in English, with meaning, register, and examples.

Commitment

Top 2,000 (common)B2noun

Vow

FormalTop 3,000 (common)C1verb
Most formal: VowMost common: Commitment
 CommitmentVow
Pronunciation🇬🇧 /["/kəˈmɪtmənt/"]/🇺🇸 /["/kəˈmɪtmənt/"]/🇬🇧 /["/vaʊ/","/vaʊz/","/vaʊd/","/ˈvaʊɪŋ/"]/🇺🇸 /["/vaʊ/","/vaʊz/","/vaʊd/","/ˈvaʊɪŋ/"]/
MeaningA promise to do something or stay loyal.A serious promise to do something.
ExampleHis commitment to the project ensured its success.She vowed never to speak to him again.
RegisterNeutralFormal
How commonTop 2,000 (common)Top 3,000 (common)
CEFR levelB2C1
Part of speechnounverb
Collocationsabsolute, complete, full, degree, level, give, make, demonstrate, commitment on, commitment to, a lack of commitment, absolute, complete, full, degree, level, give, make, demonstrate, commitment on, commitment to, a lack of commitment, big, considerable, major, have, take on, fulfil/​fulfill, commitment on, heavy, time, commitment ofquietly, silently, to, vow never to do something, vow revenge, vow revenge against somebody
Antonymsdisloyalty, indifferencebreak, violate
Common mistakesUsing 'commitment' without specifying what it's to., Confusing 'commitment' with 'commit' as a verb., 'Commitment' often misused in informal contexts.Confused with 'cow' — they sound similar but have different meanings., Using in informal contexts — 'vow' is too strong for casual promises.
Usage notesUsed when discussing promises or obligations in personal or professional contexts. It's generally appropriate in serious discussions and may not fit casual chatting.Use 'vow' when making a serious commitment, often in formal situations like weddings or ceremonies. Avoid in casual conversations.

Frequently asked questions: Commitment vs Vow

What's the difference between Commitment and Vow?

Commitment: A promise to do something or stay loyal. Vow: A serious promise to do something.

Which is more formal: Commitment and Vow?

Vow is the most formal of these.

Which is more common: Commitment and Vow?

Commitment is the most common in everyday English.

Which is more advanced: Commitment and Vow?

Vow is the highest level, at C1, on the CEFR scale.

Are Commitment and Vow the same CEFR level?

Commitment: B2, Vow: C1 on the CEFR scale.

What part of speech are Commitment and Vow?

Commitment: noun, Vow: verb.

Can you show an example of each?

Commitment: His commitment to the project ensured its success. Vow: She vowed never to speak to him again.

Can I use Commitment and Vow interchangeably?

Not always. Commitment and Vow are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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