worksheet vs piece of paper

worksheet and piece of paper both are nouns.

Word	Noun	Adjective	Verb	Adverb
worksheet	Yes	No	No	No
piece of paper	Yes	No	No	No

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

worksheet: a sheet of paper with multiple columns; used by an accountant to assemble figures for financial statements
piece of paper: paper used for writing or printing

Other hypernyms of worksheet include sheet, sheet of paper.

worksheet (noun)	piece of paper (noun)
a sheet of paper with multiple columns; used by an accountant to assemble figures for financial statements	paper used for writing or printing
a piece of paper recording work planned or done on a project