tightness vs smallness

tightness and smallness both are nouns.

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

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

Other hyponyms of tightness include littleness, pettiness, miserliness.

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