longlegs vs long-legs

longlegs and long-legs both are nouns.

Word	Noun	Adjective	Verb	Adverb
longlegs	Yes	No	No	No
long-legs	Yes	No	No	No

As nouns, longlegs and long-legs are synonyms defined as:

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

Other synonyms of longlegs include Himantopus stilt, stilt, stilt plover, stiltbird.

longlegs (noun)	long-legs (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