shadowing vs shadow

shadowing and shadow both are nouns.

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

shadowing (noun)	shadow (noun)
the act of following someone secretly	refuge from danger or observation
	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

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