roundworm vs nematode

roundworm and nematode both are nouns.

Word	Noun	Adjective	Verb	Adverb
roundworm	Yes	No	No	No
nematode	Yes	No	No	No

As nouns, roundworm and nematode are synonyms defined as:

roundworm and nematode: unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic

Other synonyms of roundworm include nematode worm.

roundworm (noun)	nematode (noun)
unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic	unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic
infections of the skin or nails caused by fungi and appearing as itching circular patches