guarantee vs pledge

guarantee and pledge both are nouns.

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

As nouns, pledge is a hypernym of guarantee; that is, pledge 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
pledge: a binding commitment to do or give or refrain from something

Other hypernyms of guarantee include assurance.

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

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

Other hypernyms of guarantee include assurance.

As verbs, pledge is a hypernym of guarantee; that is, pledge is a word with a broader meaning than guarantee:

Other hypernyms of guarantee include plight.

guarantee (noun)	pledge (noun)
a written assurance that some product or service will be provided or will meet certain specifications	a binding commitment to do or give or refrain from something
an unconditional commitment that something will happen or that something is true	a drink in honor of or to the health of a person or event
a collateral agreement to answer for the debt of another in case that person defaults	someone accepted for membership but not yet fully admitted to the group
	a deposit of personal property as security for a debt

guarantee (verb)	pledge (verb)
give surety or assume responsibility	promise solemnly and formally
promise to do or accomplish	bind or secure by a pledge
stand behind and guarantee the quality, accuracy, or condition of	give as a guarantee
make certain of	propose a toast to
	pay (an amount of money) as a contribution to a charity or service, especially at regular intervals