maintainer vs admirer

maintainer and admirer both are nouns.

Word	Noun	Adjective	Verb	Adverb
maintainer	Yes	No	No	No
admirer	Yes	No	No	No

As nouns, admirer is a hypernym of maintainer; that is, admirer is a word with a broader meaning than maintainer:

Other hypernyms of maintainer include booster, champion, friend, protagonist, supporter.

maintainer (noun)	admirer (noun)
someone who upholds or maintains	someone who admires a young woman
	a person who backs a politician or a team etc.
	a person who admires; someone who esteems or respects or approves