bean beetle vs ladybug

bean beetle and ladybug both are nouns.

Word	Noun	Adjective	Verb	Adverb
bean beetle	Yes	No	No	No
ladybug	Yes	No	No	No

As nouns, ladybug is a hypernym of bean beetle; that is, ladybug is a word with a broader meaning than bean beetle:

bean beetle: introduced into the United States from Mexico; feeds on the foliage of the bean plant
ladybug: small round bright-colored and spotted beetle that usually feeds on aphids and other insect pests

Other hypernyms of bean beetle include lady beetle, ladybeetle, ladybird, ladybird beetle.

bean beetle (noun)	ladybug (noun)
introduced into the United States from Mexico; feeds on the foliage of the bean plant	small round bright-colored and spotted beetle that usually feeds on aphids and other insect pests