lone wolf vs solitary

lone wolf and solitary both are nouns.

Word	Noun	Adjective	Verb	Adverb
lone wolf	Yes	No	No	No
solitary	Yes	Yes	No	No

As nouns, solitary is a hyponym of lone wolf; that is, solitary is a word with a more specific, narrower meaning than lone wolf:

Other hyponyms of lone wolf include hermit, recluse, solitudinarian, troglodyte.

lone wolf (noun)	solitary (noun)
a person who avoids the company or assistance of others	one who lives in solitude
	confinement of a prisoner in isolation from other prisoners

lone wolf (adjective)	solitary (adjective)
	being the only one; single and isolated from others
	lacking companions or companionship
	of plants and animals; not growing or living in groups or colonies
	devoid of creatures
	characterized by or preferring solitude