breve vs diacritic

breve and diacritic both are nouns.

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

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

breve: a diacritical mark (U-shaped) placed over a vowel to indicate a short sound
diacritic: a mark added to a letter to indicate a special pronunciation

Other hypernyms of breve include diacritical mark.

breve (noun)	diacritic (noun)
a diacritical mark (U-shaped) placed over a vowel to indicate a short sound	a mark added to a letter to indicate a special pronunciation

breve (adjective)	diacritic (adjective)
	capable of distinguishing