twenty vs government note

twenty and government note both are nouns.

Word	Noun	Adjective	Verb	Adverb
twenty	Yes	Yes	No	No
government note	Yes	No	No	No

As nouns, government note is a hypernym of twenty; that is, government note is a word with a broader meaning than twenty:

twenty: a United States bill worth 20 dollars
government note: a piece of paper money (especially one issued by a central bank)

Other hypernyms of twenty include bank bill, bank note, banker's bill, banknote, bill, Federal Reserve note, greenback, note.

twenty (noun)	government note (noun)
a United States bill worth 20 dollars	a piece of paper money (especially one issued by a central bank)
the cardinal number that is the sum of nineteen and one

twenty (adjective)	government note (adjective)
denoting a quantity consisting of 20 items or units