Difference between Earthworm and Nightcrawler

What is the difference between Earthworm and Nightcrawler?

Earthworm as a noun is a worm that lives in the ground; a worm of lumbricidae family, or, more generally, of lumbricina suborder. while Nightcrawler as a noun is an earthworm of the species lumbricus terrestris, known for its large size and nocturnal surfacings

We hope you now know whether to use Earthworm or Nightcrawler in your sentence.