voucher vs admirer

voucher and admirer both are nouns.

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

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

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

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

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