endorse vs warrant

endorse is not a noun while warrant is a noun.

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

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

Other hyponyms of endorse include guarantee, champion, defend.

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

Other hypernyms of endorse include guarantee.

endorse (noun)	warrant (noun)
	a writ from a court commanding police to perform specified acts
	a written assurance that some product or service will be provided or will meet certain specifications
	formal and explicit approval
	a type of security issued by a corporation (usually together with a bond or preferred stock) that gives the holder the right to purchase a certain amount of common stock at a stated price

endorse (verb)	warrant (verb)
sign as evidence of legal transfer	provide adequate grounds to justify (a certain course of action)
be behind; approve of	stand behind and guarantee the quality, accuracy, or condition of
guarantee as meeting a certain standard
give support or one's approval to