sheet vs revenue stamp

sheet and revenue stamp both are nouns.

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

As nouns, revenue stamp is a hyponym of sheet; that is, revenue stamp is a word with a more specific, narrower meaning than sheet:

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

Other hyponyms of sheet include slip, slip of paper, signature, folio, leaf, tear sheet, foolscap, style sheet, worksheet, stamp.

sheet (noun)	revenue stamp (noun)
bed linen consisting of a large rectangular piece of cotton or linen cloth; used in pairs	a small piece of adhesive paper that is put on an object to show that a government tax has been paid
(nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind
a flat artifact that is thin relative to its length and width
a large piece of fabric (usually canvas fabric) by means of which wind is used to propel a sailing vessel
paper used for writing or printing
newspaper with half-size pages
any broad thin expanse or surface
(mathematics) an unbounded two-dimensional shape

sheet (verb)	revenue stamp (verb)
cover with a sheet, as if by wrapping
come down as if in sheets