modifier vs content word

modifier and content word both are nouns.

Word	Noun	Adjective	Verb	Adverb
modifier	Yes	No	No	No
content word	Yes	No	No	No

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

Other hypernyms of modifier include open-class word.

modifier (noun)	content word (noun)
a gene that modifies the effect produced by another gene	a word to which an independent meaning can be assigned
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