variance vs variedness

variance and variedness both are nouns.

Word	Noun	Adjective	Verb	Adverb
variance	Yes	No	No	No
variedness	Yes	No	No	No

As nouns, variedness is a hyponym of variance; that is, variedness is a word with a more specific, narrower meaning than variance:

Other hyponyms of variance include variegation, personal equation, casualness.

variance (noun)	variedness (noun)
an activity that varies from a norm or standard	characterized by variation
an official dispensation to act contrary to a rule or regulation (typically a building regulation)
a difference between conflicting facts or claims or opinions
the quality of being subject to variation
the second moment around the mean; the expected value of the square of the deviations of a random variable from its mean value
discord that splits a group
an event that departs from expectations