splayfooted vs splayfoot

splayfooted is not a noun while splayfoot is a noun.

Word	Noun	Adjective	Verb	Adverb
splayfooted	No	Yes	No	No
splayfoot	Yes	Yes	No	No

As adjectives, splayfooted and splayfoot are synonyms defined as:

splayfooted (noun)	splayfoot (noun)
	a foot afflicted with a fallen arch; abnormally flattened and spread out

splayfooted (adjective)	splayfoot (adjective)
having feet that turn outward	having feet that turn outward