similar vs likeness

similar is not a noun while likeness is a noun.

Word	Noun	Adjective	Verb	Adverb
similar	No	Yes	No	No
likeness	Yes	No	No	No

similar (noun)	likeness (noun)
	picture consisting of a graphic image of a person or thing
	similarity in appearance or character or nature between persons or things

similar (adjective)	likeness (adjective)
marked by correspondence or resemblance
resembling or similar; having the same or some of the same characteristics; often used in combination
having the same or similar characteristics
capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability
(of words) expressing closely related meanings