shortness vs scantiness

shortness and scantiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
shortness	Yes	No	No	No
scantiness	Yes	No	No	No

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

shortness: the property of being of short spatial extent
scantiness: Of a garment, the property of being very small, light, or revealing.

Other hyponyms of shortness include skimpiness.

shortness (noun)	scantiness (noun)
an abrupt discourteous manner	the quality of being meager
the property of being shorter than average stature	Of a garment, the property of being very small, light, or revealing.
the property of being of short temporal extent
the property of being of short spatial extent
the property of being truncated or short
the condition of being short of something