n. 初学者, 生手, 新手

[ noun ]
someone new to a field or activity
<noun.person>

Tyro \Ty"ro\, n.; pl. {Tyros}. [L. tiro a newlylevied soldier, a
beginner.]
A beginner in learning; one who is in the rudiments of any
branch of study; a person imperfectly acquainted with a
subject; a novice. [Written also {tiro}.]

The management of tyros of eighteen
Is difficult. --Cowper.