sole vs volar

sole is a noun but volar is not a noun.

Word	Noun	Adjective	Verb	Adverb
sole	Yes	Yes	Yes	No
volar	No	Yes	No	No

sole (noun)	volar (noun)
right-eyed flatfish; many are valued as food; most common in warm seas especially European
the underside of footwear or a golf club
the underside of the foot
lean flesh of any of several flatfish

sole (adjective)	volar (adjective)
being the only one; single and isolated from others	relating to the palm of the hand or the sole of the foot
not divided or shared with others

sole (verb)	volar (verb)
put a new sole on