diminutiveness vs smallness

diminutiveness and smallness both are nouns.

Word	Noun	Adjective	Verb	Adverb
diminutiveness	Yes	No	No	No
smallness	Yes	No	No	No

As nouns, smallness is a hypernym of diminutiveness; that is, smallness is a word with a broader meaning than diminutiveness:

Other hypernyms of diminutiveness include littleness.

diminutiveness (noun)	smallness (noun)
the property of being very small in size	the property of having a relatively small size
	lack of generosity in trifling matters
	the property of being a relatively small amount
	the property of having relatively little strength or vigor
	The quality of being minor in influence, power, or rank.