comparison vs likeness

comparison and likeness both are nouns.

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

As nouns, likeness is a hypernym of comparison; that is, likeness is a word with a broader meaning than comparison:

comparison: qualities that are comparable
likeness: similarity in appearance or character or nature between persons or things

Other hypernyms of comparison include alikeness, similitude.

comparison (noun)	likeness (noun)
the act of examining resemblances	picture consisting of a graphic image of a person or thing
qualities that are comparable	similarity in appearance or character or nature between persons or things
relation based on similarities and differences