cotton bollworm vs vetchworm

cotton bollworm and vetchworm both are nouns.

Word	Noun	Adjective	Verb	Adverb
cotton bollworm	Yes	No	No	No
vetchworm	Yes	No	No	No

As nouns, cotton bollworm and vetchworm are synonyms defined as:

cotton bollworm and vetchworm: larva of a noctuid moth; highly destructive to especially corn and cotton and tomato crops

Other synonyms of cotton bollworm include corn earworm, Heliothis zia, tobacco budworm, tomato fruitworm.

cotton bollworm (noun)	vetchworm (noun)
larva of a noctuid moth; highly destructive to especially corn and cotton and tomato crops	larva of a noctuid moth; highly destructive to especially corn and cotton and tomato crops