diesis vs grapheme

diesis and grapheme both are nouns.

Word	Noun	Adjective	Verb	Adverb
diesis	Yes	No	No	No
grapheme	Yes	No	No	No

As nouns, grapheme is a hypernym of diesis; that is, grapheme is a word with a broader meaning than diesis:

diesis: a character used in printing to indicate a third cross reference or footnote after the asterisk and the dagger have been used
grapheme: a written symbol that is used to represent speech

Other hypernyms of diesis include character, graph, graphic symbol.

diesis (noun)	grapheme (noun)
a character used in printing to indicate a third cross reference or footnote after the asterisk and the dagger have been used	a written symbol that is used to represent speech