What is an apprentice in the warrior cat series?

Not quite sure what you mean by this....

Apprentices have the suffix -paw added to their first name, which stays with them throughout their lives.

(i.e. Pinekit, Pinepaw, Pineneedle)

Hope that answers your question, but the question itself is kinda fuzzy :l

If you wanted some apprentice names to use, just have the first name part something in nature, an animal, a tree, a flower, or just a color/descriptive Word. Examples are:

Adderpaw

Ashpaw

Bramblepaw

Bluepaw

Cedarpaw

Cinderpaw

Daisypaw

Darkpaw

Echopaw

Eaglepaw

Featherpaw

Firepaw

Greypaw

Goldenpaw

Harepaw

Hollowpaw

Icepaw

Ivypaw

Jaypaw

Juniperpaw

Kestrelpaw

Kinkpaw

Lakepaw

Lizardpaw

Moonpaw

Mistpaw

Nettlepaw

Nutpaw

Otterpaw

Oakpaw

Pinepaw (as other writer said)

Poppypaw

Quailpaw

Quickpaw

Runningpaw

Raccoonpaw

Sagepaw

Sunpaw

Thrushpaw

Thornpaw

(no 'u' names)

Vinepaw

Volepaw

Wavepaw

Waterpaw

(no 'x' names)

Yewpaw

Yellowpaw

(no 'z' names)