peace symbol vs peace sign

peace symbol and peace sign both are nouns.

Word	Noun	Adjective	Verb	Adverb
peace symbol	Yes	No	No	No
peace sign	Yes	No	No	No

As nouns, peace symbol and peace sign are synonyms defined as:

peace symbol and peace sign: a symbol that represents peace, in the form of three lines within a circle.

peace symbol (noun)	peace sign (noun)
a symbol that represents peace, in the form of three lines within a circle.	a symbol that represents peace, in the form of three lines within a circle.