Long legs and Long-legs

Long-legs and long legs are semantically related. In some cases you can use "Long-legs" instead a noun phrase "Long legs".

Long-legs noun - Long-legged three-toed black-and-white wading bird of inland ponds and marshes or brackish lagoons.

Long legs and long-legs are semantically related. Sometimes you can replace phrase "Long legs" with "Long-legs", this phrases are similar.