smallness vs niggardliness

smallness and niggardliness both are nouns.

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

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

smallness (noun)	niggardliness (noun)
the property of having a relatively small size	extreme stinginess
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.