comparison vs alikeness

comparison and alikeness both are nouns.

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

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

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

Other hypernyms of comparison include likeness, similitude.

comparison (noun)	alikeness (noun)
the act of examining resemblances	similarity in appearance or character or nature between persons or things
qualities that are comparable
relation based on similarities and differences