Beginner

• An inexperienced kid not fully prepared to play an instrument
• Eco-politician one blasted as rookie
• Like sprouts and maize, hot not cold, for a starter
• Newcomer
• Novice

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Greenhorn \Green"horn`\, n. A raw, inexperienced person; one easily imposed upon. --W. Irving.

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM OTHER ENTRIES ▪ The greenhorns headed out to the corral for their first ride.

Wikipedia Word definitions in Wikipedia