adverb vs modifier

adverb and modifier both are nouns.

Word	Noun	Adjective	Verb	Adverb
adverb	Yes	No	No	No
modifier	Yes	No	No	No

As nouns, modifier is a hypernym of adverb; that is, modifier is a word with a broader meaning than adverb:

Other hypernyms of adverb include qualifier.

adverb (noun)	modifier (noun)
a word that modifies something other than a noun	a gene that modifies the effect produced by another gene
the word class that qualifies verbs or clauses	a content word that qualifies the meaning of a noun or verb
	a person who changes something
	a moderator who makes less extreme or uncompromising