lone vs sole

lone is not a noun while sole is a noun.

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

As adjectives, lone and sole are synonyms defined as:

Other synonyms of lone include lonesome, only, solitary.

lone (noun)	sole (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

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

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