deepness vs shallowness

deepness and shallowness both are nouns.

Word	Noun	Adjective	Verb	Adverb
deepness	Yes	No	No	No
shallowness	Yes	No	No	No

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

Other hyponyms of deepness include deepness, profoundness, profundity, draft, draught, penetration, sounding.

deepness (noun)	shallowness (noun)
the quality of being physically deep	the quality of lacking physical depth
the extent downward or backward or inward	lack of depth of knowledge or thought or feeling
a low pitch that is loud and voluminous
the intellectual ability to penetrate deeply into ideas