subscript vs graphic symbol

subscript and graphic symbol both are nouns.

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

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

subscript: a character or symbol set or printed or written beneath or slightly below and to the side of another character
graphic symbol: a written symbol that is used to represent speech

Other hypernyms of subscript include character, graph, grapheme.

subscript (noun)	graphic symbol (noun)
a character or symbol set or printed or written beneath or slightly below and to the side of another character	a written symbol that is used to represent speech

subscript (adjective)	graphic symbol (adjective)
written or printed below and to one side of another character