Noob and Newcomer

Newcomer and noob are semantically related in novice topic. In some cases you can use "Newcomer" instead a noun "Noob", when it comes to topics like freshman.

Newcomer noun - A person who is just starting out in a field of activity.

Noob and newcomer are semantically related in beginner topic. You can use "Noob" instead a noun "Newcomer", if it concerns topics such as novice, freshman.