tininess vs smallness

tininess and smallness both are nouns.

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

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

Other hypernyms of tininess include littleness.

tininess (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.