shallow vs shallowness

shallow and shallowness both are nouns.

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

shallow (noun)	shallowness (noun)
a stretch of shallow water	the quality of lacking physical depth
	lack of depth of knowledge or thought or feeling

shallow (adjective)	shallowness (adjective)
lacking physical depth; having little spatial extension downward or inward from an outer surface or backward or outward from a center
not deep or strong; not affecting one deeply
lacking depth of intellect or knowledge; concerned only with what is obvious

shallow (verb)	shallowness (verb)
become shallow
make shallow