two-spotted ladybug vs ladybird

two-spotted ladybug and ladybird both are nouns.

Word	Noun	Adjective	Verb	Adverb
two-spotted ladybug	Yes	No	No	No
ladybird	Yes	No	No	No

As nouns, ladybird is a hypernym of two-spotted ladybug; that is, ladybird is a word with a broader meaning than two-spotted ladybug:

two-spotted ladybug: red ladybug with a black spot on each wing
ladybird: small round bright-colored and spotted beetle that usually feeds on aphids and other insect pests

Other hypernyms of two-spotted ladybug include lady beetle, ladybeetle, ladybird beetle, ladybug.

two-spotted ladybug (noun)	ladybird (noun)
red ladybug with a black spot on each wing	small round bright-colored and spotted beetle that usually feeds on aphids and other insect pests