grammar vs qualified

grammar is a noun but qualified is not a noun.

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

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

grammar (adjective)	qualified (adjective)
	meeting the proper standards and requirements and training for an office or position or task
	limited or restricted; not absolute
	contingent on something else
	restricted in meaning; (as e.g. `man' in `a tall man')
	holding appropriate documentation and officially on record as qualified to perform a specified function or practice a specified skill