dollar vs dollar sign

dollar and dollar sign both are nouns.

Word	Noun	Adjective	Verb	Adverb
dollar	Yes	No	No	No
dollar sign	Yes	No	No	No

As nouns, dollar and dollar sign are synonyms defined as:

Other synonyms of dollar include dollar mark.

dollar (noun)	dollar sign (noun)
a symbol of commercialism or greed	a mark ($) written before a number to indicate that it stands for the number of dollars
a piece of paper money worth one dollar	a symbol of commercialism or greed
a United States coin worth one dollar
the basic monetary unit in many countries; equal to 100 cents