chicken roundworm vs nematode

chicken roundworm and nematode both are nouns.

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

As nouns, nematode is a hypernym of chicken roundworm; that is, nematode is a word with a broader meaning than chicken roundworm:

chicken roundworm: intestinal parasite of domestic fowl
nematode: unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic

Other hypernyms of chicken roundworm include nematode worm, roundworm.

chicken roundworm (noun)	nematode (noun)
intestinal parasite of domestic fowl	unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic