Mexican bean beetle vs ladybug

Mexican bean beetle and ladybug both are nouns.

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

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

Mexican 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 Mexican bean beetle include lady beetle, ladybeetle, ladybird, ladybird beetle.

Mexican 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