acute accent vs accent mark

acute accent and accent mark both are nouns.

Word	Noun	Adjective	Verb	Adverb
acute accent	Yes	No	No	No
accent mark	Yes	No	No	No

As nouns, accent mark is a hypernym of acute accent; that is, accent mark is a word with a broader meaning than acute accent:

acute accent: a mark placed above a vowel to indicate pronunciation
accent mark: a diacritical mark used to indicate stress or placed above a vowel to indicate a special pronunciation

Other hypernyms of acute accent include accent.

acute accent (noun)	accent mark (noun)
a mark placed above a vowel to indicate pronunciation	a diacritical mark used to indicate stress or placed above a vowel to indicate a special pronunciation