Commitment vs Oaths vs Pledge vs Promise vs Vow

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

Commitment

Top 2,000 (common) B2 noun

Oaths

Formal Beyond 10,000 (less common)

Pledge

Formal Top 2,000 (common) C1 verb

Promise

Top 1,000 (very common) A2 verb

Vow

Formal Top 3,000 (common) C1 verb

Most common: Promise

	Commitment	Oaths	Pledge	Promise	Vow
Pronunciation	🇬🇧 /["/kəˈmɪtmənt/"]/ 🇺🇸 /["/kəˈmɪtmənt/"]/	🇬🇧 //oʊθs// 🇺🇸 //oʊθs//	🇬🇧 //plɛdʒ// 🇺🇸 //plɛdʒ//	🇬🇧 /["/ˈprɒmɪs/","/ˈprɒmɪsɪz/","/ˈprɒmɪst/","/ˈprɒmɪsɪŋ/"]/ 🇺🇸 /["/ˈprɑːmɪs/","/ˈprɑːmɪsɪz/","/ˈprɑːmɪst/","/ˈprɑːmɪsɪŋ/"]/	🇬🇧 /["/vaʊ/","/vaʊz/","/vaʊd/","/ˈvaʊɪŋ/"]/ 🇺🇸 /["/vaʊ/","/vaʊz/","/vaʊd/","/ˈvaʊɪŋ/"]/
Meaning	A promise to do something or stay loyal.	Formal promises, often made publicly.	To make a serious promise or commitment.	A commitment to do something or not do something.	A serious promise to do something.
Example	His commitment to the project ensured its success.	The witness took several oaths before testifying in court.	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.
Register	Neutral	Formal	Formal	Neutral	Formal
How common	Top 2,000 (common)	Beyond 10,000 (less common)	Top 2,000 (common)	Top 1,000 (very common)	Top 3,000 (common)
CEFR level	B2	-	C1	A2	C1
Part of speech	noun		verb	verb	verb
Collocations	absolute, 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 of	take an oath, swear oaths, make oaths, honor oaths	pledge allegiance, pledge support, pledge a donation	faithfully, solemnly, initially, can, cannot, seem to, to, as promised, I can’t promise anything	quietly, silently, to, vow never to do something, vow revenge, vow revenge against somebody
Antonyms	disloyalty, indifference	dishonor, break a promise	renounce, disavow, withdraw	lie, break, betray	break, violate
Common mistakes	Using 'commitment' without specifying what it's to., Confusing 'commitment' with 'commit' as a verb., 'Commitment' often misused in informal contexts.	Confused with 'oathes'; the correct plural is 'oaths'., Using 'oath' instead of 'oaths' when referring to multiple promises., Misunderstanding the religious context; not all oaths are religious.	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 notes	Used 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 official or legal contexts. Avoid in casual conversations. 'Take an oath' is a more common phrase.	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.

See it in real clips

That's a pretty big commitment. Well, not if the Mob has their way.

Commitment

The Lord Of The Rings › The return of the king

Now is the hour. Riders of Rohan, oaths you have taken.

Oaths

House Of Dragons › S1 E1

I pledge fealty to them

House Of Cards › S1 E1

Can we make that pledge?

House Of Dragons › S1 E1

I pledge fealty to them

House Of Cards › S1 E1

Can we make that pledge?

Pledge

And one system shows promise.

and I always try to keep my promise.

And one system shows promise.

and I always try to keep my promise.

Promise

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

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

Commitment: A promise to do something or stay loyal. Oaths: Formal promises, often made publicly. 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, Oaths, Pledge, Promise, and Vow?

Promise is the most common in everyday English.

Can you show an example of each?

Commitment: His commitment to the project ensured its success. Oaths: The witness took several oaths before testifying in court. 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, Oaths, Pledge, Promise, and Vow interchangeably?

Not always. Commitment, Oaths, 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.