threadworm vs roundworm

threadworm and roundworm both are nouns.

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

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

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

Other hypernyms of threadworm include nematode, nematode worm.

threadworm (noun)	roundworm (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
	infections of the skin or nails caused by fungi and appearing as itching circular patches