lowness vs truncation

lowness and truncation both are nouns.

Word	Noun	Adjective	Verb	Adverb
lowness	Yes	No	No	No
truncation	Yes	No	No	No

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

Other hyponyms of lowness include squatness, stubbiness, shortness.

lowness (noun)	truncation (noun)
the quality of being low; lacking height	the act of cutting short
a low or small degree of any quality (amount or force or temperature etc.)	the replacement of an edge or solid angle (as in cutting a gemstone) by a plane (especially by a plane that is equally inclined to the adjacent faces)
a feeling of low spirits	the property of being truncated or short
a position of inferior status; low in station or rank or fortune or estimation