interleaf vs folio

interleaf and folio both are nouns.

Word	Noun	Adjective	Verb	Adverb
interleaf	Yes	No	No	No
folio	Yes	No	No	No

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

interleaf: a blank leaf inserted between the leaves of a book
folio: a sheet of any written or printed material (especially in a manuscript or book)

Other hypernyms of interleaf include leaf.

interleaf (noun)	folio (noun)
a blank leaf inserted between the leaves of a book	a book (or manuscript) consisting of large sheets of paper folded in the middle to make two leaves or four pages
	a sheet of any written or printed material (especially in a manuscript or book)
	the system of numbering pages