admirer vs voucher

admirer and voucher both are nouns.

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

As nouns, voucher is a hyponym of admirer; that is, voucher is a word with a more specific, narrower meaning than admirer:

admirer: a person who backs a politician or a team etc.
voucher: someone who vouches for another or for the correctness of a statement

admirer (noun)	voucher (noun)
someone who admires a young woman	a negotiable certificate that can be detached and redeemed as needed
a person who backs a politician or a team etc.	a document that serves as evidence of some expenditure
a person who admires; someone who esteems or respects or approves	someone who vouches for another or for the correctness of a statement