Literature
Warrior Suffixes
This is designed for clans that might exist anywhere, not just the original 5. A note, I stopped reading Warriors halfway through Power of Three. These suffixes are not 100% traditionalist, but I do try to have some logical meaning to things. That is the prefix points to a cat's appearance or circumstances surrounding their birth, and a suffix either speaks to their skills, personality, history or enhances the prefix.
If a word has a synonym that isn't on the list, then that also works as a suffix with the same or similar meaning.
A
-arbutus: true potential hidden until adulthood
-asp: a deadly and stealthy cat
-aster: a petty motherly cat