1) Amateur 2) Amateur; neophyte 3) Apprentice 4) Apprentice-level person 5) Beginner 6) Beginner or apprentice 7) Catechumen 8) Fledgling 9) Green one 10) Green party 11) Greenhorn 12) Hardly a veteran 13) Inexperienced converted Tory 14) Inexperienced one 15) Initiate 16) Learner 17) Mythological Greek character 1) Amateur 2) Beginner 3) Cub 4) First timer 5) Greenhorn 6) Initiate 7) Learner 8) Naif 9) Neophyte 10) Newbie 11) Newcomer 12) Novice 13) Prentice 14) Rookie 15) Tenderfoot 16) Tiro 17) Trainee 
In Greek mythology, Tyro (Τυρώ) was the daughter of Salmoneus and married Cretheus, but loved Enipeus. She gave birth to Pelias and Neleus, the twin sons of Poseidon. With Cretheus she had Aeson, Pheres, and Amythaon. Her father, Salmoneus, was the brother of Athamas and Sisyphus. Tyro was married to Cretheus (with whom she had three sons, Aes...
• (n.) A beginner in learning; one who is in the rudiments of any branch of study; a person imperfectly acquainted with a subject; a novice.
tiro beginner 
a beginner in learning anything; novice.
someone new to a field or activity[Intelligent words] someone new to a field or activity