warrant vs endorse

warrant is a noun but endorse is not a noun.

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

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

Other hypernyms of warrant include back, indorse, plump for, plunk for, support.

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

Other hyponyms of warrant include cover, insure, underwrite, certify, indorse.

warrant (noun)	endorse (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

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