allograph vs graphic symbol

allograph and graphic symbol both are nouns.

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

As nouns, graphic symbol is a hypernym of allograph; that is, graphic symbol is a word with a broader meaning than allograph:

allograph: a variant form of a grapheme, as `m' or `M' or a handwritten version of that grapheme
graphic symbol: a written symbol that is used to represent speech

Other hypernyms of allograph include character, graph, grapheme.

allograph (noun)	graphic symbol (noun)
a variant form of a grapheme, as `m' or `M' or a handwritten version of that grapheme	a written symbol that is used to represent speech
a signature written by one person for another