endorse vs guarantee

endorse is not a noun while guarantee is a noun.

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

As verbs, guarantee is a hyponym of endorse; that is, guarantee is a word with a more specific, narrower meaning than endorse:

endorse: be behind; approve of
guarantee: stand behind and guarantee the quality, accuracy, or condition of

Other hyponyms of endorse include warrant, champion, defend.

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

endorse: guarantee as meeting a certain standard
guarantee: stand behind and guarantee the quality, accuracy, or condition of

Other hypernyms of endorse include warrant.

endorse (noun)	guarantee (noun)
	a written assurance that some product or service will be provided or will meet certain specifications
	an unconditional commitment that something will happen or that something is true
	a collateral agreement to answer for the debt of another in case that person defaults

endorse (verb)	guarantee (verb)
sign as evidence of legal transfer	give surety or assume responsibility
be behind; approve of	promise to do or accomplish
guarantee as meeting a certain standard	stand behind and guarantee the quality, accuracy, or condition of
give support or one's approval to	make certain of