silkworm moth vs moth

silkworm moth and moth both are nouns.

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

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

silkworm moth: moderate-sized Asiatic moth whose larvae feed on mulberry leaves and produce silk
moth: typically crepuscular or nocturnal insect having a stout body and feathery or hairlike antennae

silkworm moth (noun)	moth (noun)
moderate-sized Asiatic moth whose larvae feed on mulberry leaves and produce silk	typically crepuscular or nocturnal insect having a stout body and feathery or hairlike antennae
any silkworm moth of the family Saturniidae