silkworm moth vs giant silkworm moth

silkworm moth and giant silkworm moth both are nouns.

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

As nouns, silkworm moth and giant silkworm moth are synonyms defined as:

silkworm moth and giant silkworm moth: any silkworm moth of the family Saturniidae

silkworm moth (noun)	giant silkworm moth (noun)
moderate-sized Asiatic moth whose larvae feed on mulberry leaves and produce silk	any silkworm moth of the family Saturniidae
any silkworm moth of the family Saturniidae