longlegs vs Himantopus stilt

longlegs and Himantopus stilt both are nouns.

Word	Noun	Adjective	Verb	Adverb
longlegs	Yes	No	No	No
Himantopus stilt	Yes	No	No	No

As nouns, longlegs and Himantopus stilt are synonyms defined as:

longlegs and Himantopus stilt: long-legged three-toed black-and-white wading bird of inland ponds and marshes or brackish lagoons

Other synonyms of longlegs include long-legs, stilt, stilt plover, stiltbird.

longlegs (noun)	Himantopus stilt (noun)
long-legged three-toed black-and-white wading bird of inland ponds and marshes or brackish lagoons	long-legged three-toed black-and-white wading bird of inland ponds and marshes or brackish lagoons