black-necked stilt vs stilt

black-necked stilt and stilt both are nouns.

Word	Noun	Adjective	Verb	Adverb
black-necked stilt	Yes	No	No	No
stilt	Yes	No	No	No

As nouns, stilt is a hypernym of black-necked stilt; that is, stilt is a word with a broader meaning than black-necked stilt:

black-necked stilt: stilt of southwestern United States to northern South America having black plumage extending from the head down the back of the neck
stilt: long-legged three-toed black-and-white wading bird of inland ponds and marshes or brackish lagoons

Other hypernyms of black-necked stilt include Himantopus stilt, long-legs, longlegs, stilt plover, stiltbird.

black-necked stilt (noun)	stilt (noun)
stilt of southwestern United States to northern South America having black plumage extending from the head down the back of the neck	long-legged three-toed black-and-white wading bird of inland ponds and marshes or brackish lagoons
	long-legged three-toed wading bird of brackish marshes of Australia
	one of two stout poles with foot rests in the middle; used for walking high above the ground
	a column of wood or steel or concrete that is driven into the ground to provide support for a structure