voucher vs papers

voucher and papers both are nouns.

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

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

voucher: a document that serves as evidence of some expenditure
papers: writing that provides information (especially information of an official nature)

Other hypernyms of voucher include document, written document.

voucher (noun)	papers (noun)
a negotiable certificate that can be detached and redeemed as needed	writing that provides information (especially information of an official nature)
a document that serves as evidence of some expenditure
someone who vouches for another or for the correctness of a statement