longlegs vs limicoline bird

longlegs and limicoline bird both are nouns.

Word	Noun	Adjective	Verb	Adverb
longlegs	Yes	No	No	No
limicoline bird	Yes	No	No	No

As nouns, limicoline bird is a hypernym of longlegs; that is, limicoline bird is a word with a broader meaning than longlegs:

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

Other hypernyms of longlegs include shore bird, shorebird.

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