folio vs sheet of paper

folio and sheet of paper both are nouns.

Word	Noun	Adjective	Verb	Adverb
folio	Yes	No	No	No
sheet of paper	Yes	No	No	No

As nouns, sheet of paper is a hypernym of folio; that is, sheet of paper is a word with a broader meaning than folio:

folio: a sheet of any written or printed material (especially in a manuscript or book)
sheet of paper: paper used for writing or printing

Other hypernyms of folio include piece of paper, sheet.

folio (noun)	sheet of paper (noun)
a book (or manuscript) consisting of large sheets of paper folded in the middle to make two leaves or four pages	paper used for writing or printing
a sheet of any written or printed material (especially in a manuscript or book)
the system of numbering pages