grammar vs qualify

grammar is a noun but qualify is not a noun.

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

grammar (noun)	qualify (noun)
the branch of linguistics that deals with syntax and morphology (and sometimes also deals with semantics)

grammar (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