sole vs lone

sole is a noun but lone is not a noun.

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

As adjectives, sole and lone are synonyms defined as:

Other synonyms of sole include lonesome, only, solitary.

sole (noun)	lone (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)	lone (adjective)
being the only one; single and isolated from others	being the only one; single and isolated from others
not divided or shared with others	lacking companions or companionship
	characterized by or preferring solitude

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