Commitment vs Oath vs Pledge vs Promise vs Vow

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

Commitment

Top 2,000 (common)B2noun

Oath

FormalTop 3,000 (common)B1noun

Pledge

FormalTop 2,000 (common)C1verb

Promise

Top 1,000 (very common)A2verb

Vow

FormalTop 3,000 (common)C1verb
Most common: Promise
 CommitmentOathPledgePromiseVow
Pronunciation🇬🇧 /["/kəˈmɪtmənt/"]/🇺🇸 /["/kəˈmɪtmənt/"]/🇬🇧 //əʊθ//🇺🇸 //oʊθ//🇬🇧 //plɛdʒ//🇺🇸 //plɛdʒ//🇬🇧 /["/ˈprɒmɪs/","/ˈprɒmɪsɪz/","/ˈprɒmɪst/","/ˈprɒmɪsɪŋ/"]/🇺🇸 /["/ˈprɑːmɪs/","/ˈprɑːmɪsɪz/","/ˈprɑːmɪst/","/ˈprɑːmɪsɪŋ/"]/🇬🇧 /["/vaʊ/","/vaʊz/","/vaʊd/","/ˈvaʊɪŋ/"]/🇺🇸 /["/vaʊ/","/vaʊz/","/vaʊd/","/ˈvaʊɪŋ/"]/
MeaningA promise to do something or stay loyal.A promise to tell the truth or do something important.To make a serious promise or commitment.A commitment to do something or not do something.A serious promise to do something.
ExampleHis commitment to the project ensured its success.He took an oath to uphold the law.She decided to pledge her support to the charity event.I promise to help you with your homework.She vowed never to speak to him again.
RegisterNeutralFormalFormalNeutralFormal
How commonTop 2,000 (common)Top 3,000 (common)Top 2,000 (common)Top 1,000 (very common)Top 3,000 (common)
CEFR levelB2B1C1A2C1
Part of speechnounnounverbverbverb
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 oftake an oath, sworn oath, oath of office, oath of allegiancepledge allegiance, pledge support, pledge a donationfaithfully, solemnly, initially, can, cannot, seem to, to, as promised, I can’t promise anythingquietly, silently, to, vow never to do something, vow revenge, vow revenge against somebody
Antonymsdisloyalty, indifferencelie, dishonestyrenounce, disavow, withdrawlie, break, betraybreak, violate
Common mistakesUsing 'commitment' without specifying what it's to., Confusing 'commitment' with 'commit' as a verb., 'Commitment' often misused in informal contexts.Confusing 'oath' with 'oaths' as the plural form., Using it in informal settings when it's typically formal.Confused with 'pledged' vs 'pledge' as different tenses., Omitting the object after the verb., Using 'pledge' when referring to a general promise instead of a formal commitment.Confusing 'promise' with 'vow' or 'pledge' in terms of strength., Using 'promise' without an object (e.g., 'I promise' should specify what)., Misusing in the past tense (e.g., 'I promised' without a follow-up).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.Used in legal and ceremonial contexts. It may not be appropriate in casual conversation.Typically used in formal contexts, such as during ceremonies or official statements. Avoid in casual conversations.Use 'promise' when you want to express a vow or assurance. Common in both spoken and written contexts, but avoid in formal legal documents.Use 'vow' when making a serious commitment, often in formal situations like weddings or ceremonies. Avoid in casual conversations.

Frequently asked questions: Commitment vs Oath vs Pledge vs Promise vs Vow

What's the difference between Commitment, Oath, Pledge, Promise, and Vow?

Commitment: A promise to do something or stay loyal. Oath: A promise to tell the truth or do something important. Pledge: To make a serious promise or commitment. Promise: A commitment to do something or not do something. Vow: A serious promise to do something.

Which is more common: Commitment, Oath, Pledge, Promise, and Vow?

Promise is the most common in everyday English.

Are Commitment, Oath, Pledge, Promise, and Vow the same CEFR level?

Commitment: B2, Oath: B1, Pledge: C1, Promise: A2, Vow: C1 on the CEFR scale.

What part of speech are Commitment, Oath, Pledge, Promise, and Vow?

Commitment: noun, Oath: noun, Pledge: verb, Promise: verb, Vow: verb.

Can you show an example of each?

Commitment: His commitment to the project ensured its success. Oath: He took an oath to uphold the law. Pledge: She decided to pledge her support to the charity event. Promise: I promise to help you with your homework. Vow: She vowed never to speak to him again.

Can I use Commitment, Oath, Pledge, Promise, and Vow interchangeably?

Not always. Commitment, Oath, Pledge, Promise, 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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