Himantopus stilt vs longlegs

Himantopus stilt and longlegs both are nouns.

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

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

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

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

Himantopus stilt (noun)	longlegs (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