Definition: (noun) A newcomer, especially one who is unfamiliar with the ways of a place or group.
Synonyms: novice, beginner, apprentice, naïf, learner, ingénue, tyro, newbie, neophyte.
Usage: I am a bit of a greenhorn in the kitchen, but I am a fast learner and expect to be cooking like a pro in no time.
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Source: The Free Dictionary