Eelworm and Nematode worm

Eelworm noun - Any of various small free-living plant-parasitic roundworms.

Nematode worm and eelworm are semantically related. In some cases you can use "Nematode worm" instead a noun "Eelworm".

Nematode worm noun - Unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic.

Eelworm and nematode worm are semantically related. Sometimes you can replace term "Eelworm" with "Nematode worm", this terms are similar.