mainstay vs admirer

mainstay and admirer both are nouns.

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

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

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

mainstay (noun)	admirer (noun)
the forestay that braces the mainmast	someone who admires a young woman
a central cohesive source of support and stability	a person who backs a politician or a team etc.
a prominent supporter	a person who admires; someone who esteems or respects or approves