wild wilkworm vs caterpillar

wild wilkworm and caterpillar both are nouns.

Word	Noun	Adjective	Verb	Adverb
wild wilkworm	Yes	No	No	No
caterpillar	Yes	No	No	No

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

wild wilkworm: larva of a saturniid moth; spins a large amount of strong silk in constructing its cocoon
caterpillar: a wormlike and often brightly colored and hairy or spiny larva of a butterfly or moth

wild wilkworm (noun)	caterpillar (noun)
larva of a saturniid moth; spins a large amount of strong silk in constructing its cocoon	a wormlike and often brightly colored and hairy or spiny larva of a butterfly or moth