silkworm vs caterpillar

silkworm and caterpillar both are nouns.

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

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

silkworm: the commercially bred hairless white caterpillar of the domestic silkworm moth which spins a cocoon that can be processed to yield silk fiber; the principal source of commercial silk
caterpillar: a wormlike and often brightly colored and hairy or spiny larva of a butterfly or moth

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

silkworm: 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

silkworm (noun)	caterpillar (noun)
the commercially bred hairless white caterpillar of the domestic silkworm moth which spins a cocoon that can be processed to yield silk fiber; the principal source of commercial silk	a wormlike and often brightly colored and hairy or spiny larva of a butterfly or moth
larva of a saturniid moth; spins a large amount of strong silk in constructing its cocoon