accent mark vs ague

accent mark and ague both are nouns.

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

As nouns, ague is a hyponym of accent mark; that is, ague is a word with a more specific, narrower meaning than accent mark:

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

Other hyponyms of accent mark include stress mark, acute, acute accent, grave, grave accent, double acute accent, Hungarumlaut.

accent mark (noun)	ague (noun)
a diacritical mark used to indicate stress or placed above a vowel to indicate a special pronunciation	a mark placed above a vowel to indicate pronunciation
	a fit of shivering or shaking
	successive stages of chills and fever that is a symptom of malaria