shore bird vs long-legs

shore bird and long-legs both are nouns.

Word	Noun	Adjective	Verb	Adverb
shore bird	Yes	No	No	No
long-legs	Yes	No	No	No

As nouns, long-legs is a hyponym of shore bird; that is, long-legs is a word with a more specific, narrower meaning than shore bird:

shore bird: any of numerous wading birds that frequent mostly seashores and estuaries
long-legs: long-legged three-toed black-and-white wading bird of inland ponds and marshes or brackish lagoons

shore bird (noun)	long-legs (noun)
any of numerous wading birds that frequent mostly seashores and estuaries	long-legged three-toed black-and-white wading bird of inland ponds and marshes or brackish lagoons