lady beetle vs ladybeetle

lady beetle and ladybeetle both are nouns.

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

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

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

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

lady 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