dollar bill vs one dollar bill

dollar bill and one dollar bill both are nouns.

Word	Noun	Adjective	Verb	Adverb
dollar bill	Yes	No	No	No
one dollar bill	Yes	No	No	No

As nouns, dollar bill and one dollar bill are synonyms defined as:

dollar bill and one dollar bill: a piece of paper money worth one dollar

Other synonyms of dollar bill include buck, clam, dollar.

dollar bill (noun)	one dollar bill (noun)
a piece of paper money worth one dollar	a piece of paper money worth one dollar