ligature vs graphic symbol

ligature and graphic symbol both are nouns.

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

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

Other hypernyms of ligature include character, graph, grapheme.

ligature (noun)	graphic symbol (noun)
the act of tying or binding things together	a written symbol that is used to represent speech
something used to tie or bind
thread used by surgeons to bind a vessel (as to constrict the flow of blood)
a metal band used to attach a reed to the mouthpiece of a clarinet or saxophone
(music) a group of notes connected by a slur
character consisting of two or more letters combined into one