smallness vs puniness

smallness and puniness both are nouns.

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

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

smallness (noun)	puniness (noun)
the property of having a relatively small size	smallness of stature
lack of generosity in trifling matters	the quality of being unimportant and petty or frivolous
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.