premonition vs apprehension

premonition and apprehension both are nouns.

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

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

Other hypernyms of premonition include apprehensiveness, dread.

premonition (noun)	apprehension (noun)
an early warning about a future event	the act of apprehending (especially apprehending a criminal)
a feeling of evil to come	the cognitive condition of someone who understands
	painful expectation
	fearful expectation or anticipation