threadworm vs nematode worm

threadworm and nematode worm both are nouns.

Word	Noun	Adjective	Verb	Adverb
threadworm	Yes	No	No	No
nematode worm	Yes	No	No	No

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

threadworm: small threadlike worm infesting human intestines and rectum especially in children
nematode worm: unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic

Other hypernyms of threadworm include nematode, roundworm.

threadworm (noun)	nematode worm (noun)
small threadlike worm infesting human intestines and rectum especially in children	unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic