revenue stamp vs sheet of paper

revenue stamp and sheet of paper both are nouns.

Word	Noun	Adjective	Verb	Adverb
revenue stamp	Yes	No	No	No
sheet of paper	Yes	No	No	No

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

revenue stamp: a small piece of adhesive paper that is put on an object to show that a government tax has been paid
sheet of paper: paper used for writing or printing

Other hypernyms of revenue stamp include piece of paper, sheet.

revenue stamp (noun)	sheet of paper (noun)
a small piece of adhesive paper that is put on an object to show that a government tax has been paid	paper used for writing or printing