newcomer

Other forms: newcomers

When you show up at your first meeting of the local swim club and you're the only one who didn't bring a towel, it may be because you're a newcomer, or someone who's new at participating in a particular group.

When you're a newcomer, you're an outsider just joining an activity or group. There are a lot of great words that have the same meaning as newcomer, like neophyte, rookie, and Johnny-come-lately. One popular slang term for newcomer is newbie, which is often shortened on the Internet to noob.