strawworm vs caseworm

strawworm and caseworm both are nouns.

Word	Noun	Adjective	Verb	Adverb
strawworm	Yes	No	No	No
caseworm	Yes	No	No	No

As nouns, caseworm is a hypernym of strawworm; that is, caseworm is a word with a broader meaning than strawworm:

strawworm: larva of the caddis fly; constructs a case of silk covered with sand or plant debris
caseworm: insect larva that constructs a protective case around its body

strawworm (noun)	caseworm (noun)
larva of chalcid flies injurious to the straw of wheat and other grains	insect larva that constructs a protective case around its body
larva of the caddis fly; constructs a case of silk covered with sand or plant debris