Synonyms for Greenhorn:

n.

protege, learner, workie, the uninitiated. boor, yokel, rustic. freshman, tenderfoot, fledgling, novitiate, start, tyro, abecedarian. amateur (noun)
dilettante, apprentice, lay person, layman, nonprofessional, initiate, amateur, novice, neophyte, beginner.
greenhorn (noun)
rookie, cub.
inexperienced person (noun)
learner, tenderfoot, apprentice, novice, neophyte, amateur, tyro, beginner.
newcomer (noun)
tenderfoot.

Other synonyms:

abecedarian, tenderfoot, fledgling. tyro. novitiate. beginner
freshman.
Other relevant words:
freshman, cub, tyro, novitiate, rustic, learner, abecedarian, tenderfoot, rookie, fledgling.

Usage examples for greenhorn

  1. I'm no greenhorn you know. – Left Guard Gilbert by Ralph Henry Barbour