tilde vs diacritic

tilde and diacritic both are nouns.

Word	Noun	Adjective	Verb	Adverb
tilde	Yes	No	No	No
diacritic	Yes	Yes	No	No

As nouns, diacritic is a hypernym of tilde; that is, diacritic is a word with a broader meaning than tilde:

tilde: a diacritical mark (~) placed over the letter n in Spanish to indicate a palatal nasal sound or over a vowel in Portuguese to indicate nasalization
diacritic: a mark added to a letter to indicate a special pronunciation

Other hypernyms of tilde include diacritical mark.

tilde (noun)	diacritic (noun)
a diacritical mark (~) placed over the letter n in Spanish to indicate a palatal nasal sound or over a vowel in Portuguese to indicate nasalization	a mark added to a letter to indicate a special pronunciation

tilde (adjective)	diacritic (adjective)
	capable of distinguishing