One fully skilled or well versed in anything; a proficient
Well skilled; completely versed; thoroughly proficient
non-professional; amateur
A type of firecracker, used by farmers to scare rooks.
A novice.
An athlete either new to the sport or to a team or in his first year of professional competition, especially said of baseball, basketball, hockey and American football players.
An inexperienced recruit, especially in the police or armed forces.