A new user or participant; someone who is extremely new and inexperienced (to a game or activity). A beginner.
Anything recently introduced into a setting, especially something that replaces an older version.
A newcomer, someone new to something.
A stenotopic species.
A physician whose practice is limited to a particular branch of medicine or surgery.
Someone who is an expert in, or devoted to, some specific branch of study or research.
Any of several non-commissioned ranks corresponding to that of corporal.
An organism that is specialized for a particular environment.
Specialised, involving detailed knowledge of a restricted topic.