1) Amateur 2) Civilian 3) Lay 4) Layman 5) Nonpro 6) Unprofessional 
• (a.) Not belonging to a profession; not done by, or proceeding from, professional men; contrary to professional usage. • (a.) Not belonging to a profession; not done by, or proceeding from, professional men; contrary to professional usage.
Non`pro·fes'sion·al adjective Not belonging to a profession; not done by, or proceeding from, professional men; contrary to professional usage. 
[adj] - not professional
adjective not professional; not engaged in a profession or engaging in as a profession or for gain; `the nonprofessional wives of his male colleagues`; `nonprofessional actors`
not a member of or trained in a specific profession. · not offering or engaged in for payment or a monetary prize; amateur: a nonprofessional league; a nonprofessional player.