cutworm vs caterpillar

cutworm and caterpillar both are nouns.

Word	Noun	Adjective	Verb	Adverb
cutworm	Yes	No	No	No
caterpillar	Yes	No	No	No

As nouns, caterpillar is a hypernym of cutworm; that is, caterpillar is a word with a broader meaning than cutworm:

cutworm: North American moth whose larvae feed on young plant stems cutting them off at the ground
caterpillar: a wormlike and often brightly colored and hairy or spiny larva of a butterfly or moth

cutworm (noun)	caterpillar (noun)
North American moth whose larvae feed on young plant stems cutting them off at the ground	a wormlike and often brightly colored and hairy or spiny larva of a butterfly or moth