silkworm vs giant silkworm

silkworm and giant silkworm both are nouns.

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

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

silkworm and giant silkworm: larva of a saturniid moth; spins a large amount of strong silk in constructing its cocoon

Other synonyms of silkworm include wild wilkworm.

silkworm (noun)	giant silkworm (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	larva of a saturniid moth; spins a large amount of strong silk in constructing its cocoon
larva of a saturniid moth; spins a large amount of strong silk in constructing its cocoon