adjective vs modifier

adjective and modifier both are nouns.

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

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

Other hypernyms of adjective include qualifier.

adjective (noun)	modifier (noun)
a word that expresses an attribute of something	a gene that modifies the effect produced by another gene
the word class that qualifies nouns	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

adjective (adjective)	modifier (adjective)
relating to court practice and procedure as opposed to the principles of law
of or relating to or functioning as an adjective