uniformness vs similarity

uniformness and similarity both are nouns.

Word	Noun	Adjective	Verb	Adverb
uniformness	Yes	No	No	No
similarity	Yes	No	No	No

As nouns, similarity is a hypernym of uniformness; that is, similarity is a word with a broader meaning than uniformness:

uniformness: the quality of lacking diversity or variation (even to the point of boredom)
similarity: the quality of being similar

uniformness (noun)	similarity (noun)
the quality of lacking diversity or variation (even to the point of boredom)	the quality of being similar
	a Gestalt principle of organization holding that (other things being equal) parts of a stimulus field that are similar to each other tend to be perceived as belonging together as a unit