double obelisk vs grapheme

double obelisk and grapheme both are nouns.

Word	Noun	Adjective	Verb	Adverb
double obelisk	Yes	No	No	No
grapheme	Yes	No	No	No

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

double obelisk: 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 double obelisk include character, graph, graphic symbol.

double obelisk (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