qualifier vs qualify

qualifier is a noun but qualify is not a noun.

Word	Noun	Adjective	Verb	Adverb
qualifier	Yes	No	No	No
qualify	No	No	Yes	No

qualifier (noun)	qualify (noun)
a content word that qualifies the meaning of a noun or verb
a contestant who meets certain requirements and so qualifies to take part in the next stage of competition

qualifier (verb)	qualify (verb)
	make fit or prepared
	add a modifier to a constituent
	make more specific
	specify as a condition or requirement in a contract or agreement; make an express demand or provision in an agreement
	describe or portray the character or the qualities or peculiarities of
	pronounce fit or able
	prove capable or fit; meet requirements