Roundworm More Condition_symptoms What Are The Differences Between Earthworm, Roundworm And Tapeworm?

What are the differences between earthworm, roundworm and tapeworm? - roundworm more condition_symptoms

I study the taxonomy, and I am surprised that 3 strains of Animalia is reserved only for worms!

So does anyone know what differences between the 3 following strains of worms are there?

Annelida - earthworms
Nematoda - Worm
Platyhelminthes - for example, had

Please do not give me Wikipedia articles. Thx!