diacritic vs wedge

diacritic and wedge both are nouns.

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

As nouns, wedge is a hyponym of diacritic; that is, wedge is a word with a more specific, narrower meaning than diacritic:

diacritic: a mark added to a letter to indicate a special pronunciation
wedge: a diacritical mark (an inverted circumflex) placed above certain letters (such as the letter c) to indicate pronunciation

Other hyponyms of diacritic include accent, accent mark, breve, cedilla, circumflex, hacek, macron, tilde, umlaut, diaeresis, dieresis.

diacritic (noun)	wedge (noun)
a mark added to a letter to indicate a special pronunciation	something solid that is usable as an inclined plane (shaped like a V) that can be pushed between two things to separate them
	a block of wood used to prevent the sliding or rolling of a heavy object
	a heel that is an extension of the sole of the shoe
	(golf) an iron with considerable loft and a broad sole
	a diacritical mark (an inverted circumflex) placed above certain letters (such as the letter c) to indicate pronunciation
	a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States
	any shape that is triangular in cross section

diacritic (adjective)	wedge (adjective)
capable of distinguishing

diacritic (verb)	wedge (verb)
	squeeze like a wedge into a tight space
	put, fix, force, or implant