guarantee vs assurance

guarantee and assurance both are nouns.

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

As nouns, assurance is a hypernym of guarantee; that is, assurance is a word with a broader meaning than guarantee:

guarantee: a written assurance that some product or service will be provided or will meet certain specifications
assurance: a binding commitment to do or give or refrain from something

Other hypernyms of guarantee include pledge.

As nouns, assurance is a hypernym of guarantee; that is, assurance is a word with a broader meaning than guarantee:

guarantee: an unconditional commitment that something will happen or that something is true
assurance: a binding commitment to do or give or refrain from something

Other hypernyms of guarantee include pledge.

guarantee (noun)	assurance (noun)
a written assurance that some product or service will be provided or will meet certain specifications	freedom from doubt; belief in yourself and your abilities
an unconditional commitment that something will happen or that something is true	a statement intended to inspire confidence
a collateral agreement to answer for the debt of another in case that person defaults	a binding commitment to do or give or refrain from something
	a British term for some kinds of insurance

guarantee (verb)	assurance (verb)
give surety or assume responsibility
promise to do or accomplish
stand behind and guarantee the quality, accuracy, or condition of
make certain of