sole vs insole

sole and insole both are nouns.

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

As nouns, insole is a hyponym of sole; that is, insole is a word with a more specific, narrower meaning than sole:

Other hyponyms of sole include half sole, innersole, outsole.

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

sole (adjective)	insole (adjective)
being the only one; single and isolated from others
not divided or shared with others

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