ladybird beetle vs ladybeetle

ladybird beetle and ladybeetle both are nouns.

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

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

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

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

ladybird beetle (noun)	ladybeetle (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