grapheme vs graphic symbol

grapheme and graphic symbol both are nouns.

Word	Noun	Adjective	Verb	Adverb
grapheme	Yes	No	No	No
graphic symbol	Yes	No	No	No

As nouns, grapheme and graphic symbol are synonyms defined as:

grapheme and graphic symbol: a written symbol that is used to represent speech

Other synonyms of grapheme include character, graph.

grapheme (noun)	graphic symbol (noun)
a written symbol that is used to represent speech	a written symbol that is used to represent speech