nonprofessional vs amateur

nonprofessional is not a noun while amateur is a noun.

Word	Noun	Adjective	Verb	Adverb
nonprofessional	No	Yes	No	No
amateur	Yes	Yes	No	No

nonprofessional (noun)	amateur (noun)
	someone who pursues a study or sport as a pastime
	an athlete who does not play for pay

nonprofessional (adjective)	amateur (adjective)
not professional; not engaged in a profession or engaging in as a profession or for gain	engaged in as a pastime
	lacking professional skill or expertise