shadow vs shadowing

shadow and shadowing both are nouns.

Word	Noun	Adjective	Verb	Adverb
shadow	Yes	No	Yes	No
shadowing	Yes	No	No	No

shadow (noun)	shadowing (noun)
refuge from danger or observation	the act of following someone secretly
something existing in perception only
an indication that something has been present
a premonition of something adverse
an unilluminated area
a spy employed to follow someone and report their movements
an inseparable companion
a dominating and pervasive presence
shade within clear boundaries

shadow (verb)	shadowing (verb)
follow, usually without the person's knowledge
make appear small by comparison
cast a shadow over