splitworm vs gelechiid moth

splitworm and gelechiid moth both are nouns.

Word	Noun	Adjective	Verb	Adverb
splitworm	Yes	No	No	No
gelechiid moth	Yes	No	No	No

As nouns, gelechiid moth is a hypernym of splitworm; that is, gelechiid moth is a word with a broader meaning than splitworm:

splitworm: greyish-brown moth whose larva is the potato tuberworm
gelechiid moth: small slender-winged moths whose larvae are agricultural pests

Other hypernyms of splitworm include gelechiid.

splitworm (noun)	gelechiid moth (noun)
greyish-brown moth whose larva is the potato tuberworm	small slender-winged moths whose larvae are agricultural pests