wheat eelworm vs nematode worm

wheat eelworm and nematode worm both are nouns.

Word	Noun	Adjective	Verb	Adverb
wheat eelworm	Yes	No	No	No
nematode worm	Yes	No	No	No

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

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

Other hypernyms of wheat eelworm include nematode, roundworm.

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