kaki vs longlegs

kaki and longlegs both are nouns.

Word	Noun	Adjective	Verb	Adverb
kaki	Yes	No	No	No
longlegs	Yes	No	No	No

As nouns, longlegs is a hypernym of kaki; that is, longlegs is a word with a broader meaning than kaki:

kaki: blackish stilt of New Zealand sometimes considered a color phase of the white-headed stilt
longlegs: long-legged three-toed black-and-white wading bird of inland ponds and marshes or brackish lagoons

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

kaki (noun)	longlegs (noun)
blackish stilt of New Zealand sometimes considered a color phase of the white-headed stilt	long-legged three-toed black-and-white wading bird of inland ponds and marshes or brackish lagoons
small deciduous Asiatic tree bearing large red or orange edible astringent fruit