qualified vs grammar

qualified is not a noun while grammar is a noun.

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

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

qualified (adjective)	grammar (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