Which words haven't yet been used as characters' names, but could be?

So, most Sonic characters' names are actual regular words. Shadow, Tails, Blaze, Jet, Mimic, Whisper, Chaos, Big, Fang, etc.

So, what are some other words that could be used as potential new characters' names?

For instance, we have Gold the Tenrec and Silver the Hedgehog, but I don't think we have anyone called Bronze.