Difference between Ratter and Turncoat

What is the difference between Ratter and Turncoat?

Ratter as a noun is anything which catches rats; esp., a dog trained to catch rats; a rat terrier. while Turncoat as a noun is a traitor; one who turns against a previous affiliation or allegiance; a defector, renegade or apostate

We hope you now know whether to use Ratter or Turncoat in your sentence.