vetchworm vs bollworm

vetchworm and bollworm both are nouns.

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

As nouns, bollworm is a hypernym of vetchworm; that is, bollworm is a word with a broader meaning than vetchworm:

vetchworm: larva of a noctuid moth; highly destructive to especially corn and cotton and tomato crops
bollworm: any of various moth caterpillars that destroy cotton bolls

vetchworm (noun)	bollworm (noun)
larva of a noctuid moth; highly destructive to especially corn and cotton and tomato crops	any of various moth caterpillars that destroy cotton bolls