wheat eelworm vs roundworm

wheat eelworm and roundworm both are nouns.

Word	Noun	Adjective	Verb	Adverb
wheat eelworm	Yes	No	No	No
roundworm	Yes	No	No	No

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

wheat eelworm: small roundworm parasitic on wheat
roundworm: unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic

Other hypernyms of wheat eelworm include nematode, nematode worm.

wheat eelworm (noun)	roundworm (noun)
small roundworm parasitic on wheat	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