ailanthus silkworm vs silkworm

ailanthus silkworm and silkworm both are nouns.

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

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

ailanthus silkworm: large green silkworm of the cynthia moth
silkworm: larva of a saturniid moth; spins a large amount of strong silk in constructing its cocoon

Other hypernyms of ailanthus silkworm include giant silkworm, wild wilkworm.

ailanthus silkworm (noun)	silkworm (noun)
large green silkworm of the cynthia moth	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
	larva of a saturniid moth; spins a large amount of strong silk in constructing its cocoon