professional vs amateur

professional and amateur both are nouns.

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

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

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