shadiness vs shadowiness

shadiness and shadowiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
shadiness	Yes	No	No	No
shadowiness	Yes	No	No	No

As nouns, shadiness and shadowiness are synonyms defined as:

shadiness and shadowiness: relative darkness caused by light rays being intercepted by an opaque body

Other synonyms of shadiness include shade.

shadiness (noun)	shadowiness (noun)
questionable honesty or legality	relative darkness caused by light rays being intercepted by an opaque body
relative darkness caused by light rays being intercepted by an opaque body