assurance vs vow

assurance and vow both are nouns.

Word	Noun	Adjective	Verb	Adverb
assurance	Yes	No	No	No
vow	Yes	No	Yes	No

As nouns, vow is a hyponym of assurance; that is, vow is a word with a more specific, narrower meaning than assurance:

assurance: a binding commitment to do or give or refrain from something
vow: a solemn pledge (to oneself or to another or to a deity) to do something or to behave in a certain manner

Other hyponyms of assurance include guarantee, warrant, warrantee, warranty, guarantee, plight, troth.

assurance (noun)	vow (noun)
freedom from doubt; belief in yourself and your abilities	a solemn pledge (to oneself or to another or to a deity) to do something or to behave in a certain manner
a statement intended to inspire confidence
a binding commitment to do or give or refrain from something
a British term for some kinds of insurance

assurance (verb)	vow (verb)
	make a vow; promise
	dedicate to a deity by a vow