splayfoot vs human foot

splayfoot and human foot both are nouns.

Word	Noun	Adjective	Verb	Adverb
splayfoot	Yes	Yes	No	No
human foot	Yes	No	No	No

As nouns, human foot is a hypernym of splayfoot; that is, human foot is a word with a broader meaning than splayfoot:

splayfoot: a foot afflicted with a fallen arch; abnormally flattened and spread out
human foot: the part of the leg of a human being below the ankle joint

Other hypernyms of splayfoot include foot, pes.

splayfoot (noun)	human foot (noun)
a foot afflicted with a fallen arch; abnormally flattened and spread out	the part of the leg of a human being below the ankle joint

splayfoot (adjective)	human foot (adjective)
having feet that turn outward