Synonyms for Roundworm (same or very similar meaning)
WordNet sense 1 (infections of the skin or nails caused by fungi and appearing as itching circular patches):
ringworm, tineaWordNet sense 2 (unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic):
nematode, nematode wormFrom the ODE community, based on WordNetadd/edit