endorser vs friend

endorser and friend both are nouns.

Word	Noun	Adjective	Verb	Adverb
endorser	Yes	No	No	No
friend	Yes	No	No	No

As nouns, friend is a hypernym of endorser; that is, friend is a word with a broader meaning than endorser:

Other hypernyms of endorser include admirer, booster, champion, protagonist, supporter.

endorser (noun)	friend (noun)
someone who expresses strong approval	a person you know well and regard with affection and trust
a person who transfers his ownership interest in something by signing a check or negotiable security	a person with whom you are acquainted
	an associate who provides cooperation or assistance
	a person who backs a politician or a team etc.