o, e, k, r, i are letters that make 'rookie'
IE, ki, Ro, ok, OK, ie, rook, Ki are words within 'rookie'
rookier, rookies are words created by adding a letter to 'rookie'
1 possible definitions for 'rookie'
Under this definition, rookie is a noun and has the following properties:
cub, greenhorn have the same meaning as 'rookie'
'rookie' can be a type of novice, tyro, tiro, initiate, beginner.