amateur vs professional

amateur and professional both are nouns.

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

amateur (noun)	professional (noun)
someone who pursues a study or sport as a pastime	a person engaged in one of the learned professions
an athlete who does not play for pay	an authority qualified to teach apprentices
	an athlete who plays for pay

amateur (adjective)	professional (adjective)
engaged in as a pastime	engaged in a profession or engaging in as a profession or means of livelihood
lacking professional skill or expertise	characteristic of or befitting a profession or one engaged in a profession
	of or relating to a profession
	of or relating to or suitable as a profession
	engaged in by members of a profession