shore bird vs shorebird

shore bird and shorebird both are nouns.

Word	Noun	Adjective	Verb	Adverb
shore bird	Yes	No	No	No
shorebird	Yes	No	No	No

As nouns, shore bird and shorebird are synonyms defined as:

shore bird and shorebird: any of numerous wading birds that frequent mostly seashores and estuaries

Other synonyms of shore bird include limicoline bird.

shore bird (noun)	shorebird (noun)
any of numerous wading birds that frequent mostly seashores and estuaries	any of numerous wading birds that frequent mostly seashores and estuaries