ladybeetle vs ladybird beetle

ladybeetle and ladybird beetle both are nouns.

Word	Noun	Adjective	Verb	Adverb
ladybeetle	Yes	No	No	No
ladybird beetle	Yes	No	No	No

As nouns, ladybeetle and ladybird beetle are synonyms defined as:

ladybeetle and ladybird beetle: small round bright-colored and spotted beetle that usually feeds on aphids and other insect pests

Other synonyms of ladybeetle include lady beetle, ladybird, ladybug.

ladybeetle (noun)	ladybird beetle (noun)
small round bright-colored and spotted beetle that usually feeds on aphids and other insect pests	small round bright-colored and spotted beetle that usually feeds on aphids and other insect pests