Difference between Poikilotherm and Ectotherm

What is the difference between Poikilotherm and Ectotherm?

Poikilotherm as a noun is a cold-blooded animal while Ectotherm as a noun is a cold-blooded animal which regulates its body temperature by exchanging heat with its surroundings

We hope you now know whether to use Poikilotherm or Ectotherm in your sentence.