smallness vs tightness

smallness and tightness both are nouns.

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

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

smallness (noun)	tightness (noun)
the property of having a relatively small size	lack of movement or room for movement
lack of generosity in trifling matters	extreme stinginess
the property of being a relatively small amount	the spatial property of being crowded together
the property of having relatively little strength or vigor	a tight feeling in some part of the body
The quality of being minor in influence, power, or rank.	a state occasioned by scarcity of money and a shortage of credit