loner vs lone wolf

loner and lone wolf both are nouns.

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

As nouns, loner and lone wolf are synonyms defined as:

loner and lone wolf: a person who avoids the company or assistance of others

Other synonyms of loner include lone hand.

loner (noun)	lone wolf (noun)
a person who avoids the company or assistance of others	a person who avoids the company or assistance of others