shadow vs premonition

shadow and premonition both are nouns.

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

As nouns, premonition is a hypernym of shadow; that is, premonition is a word with a broader meaning than shadow:

Other hypernyms of shadow include boding, foreboding, presentiment.

shadow (noun)	premonition (noun)
refuge from danger or observation	an early warning about a future event
something existing in perception only	a feeling of evil to come
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)	premonition (verb)
follow, usually without the person's knowledge
make appear small by comparison
cast a shadow over