magical spell vs whammy

magical spell and whammy both are nouns.

Word	Noun	Adjective	Verb	Adverb
magical spell	Yes	No	No	No
whammy	Yes	No	No	No

As nouns, whammy is a hyponym of magical spell; that is, whammy is a word with a more specific, narrower meaning than magical spell:

Other hyponyms of magical spell include conjuration, incantation, curse, hex, jinx, hocus-pocus.

magical spell (noun)	whammy (noun)
a verbal formula believed to have magical force	an evil spell
	a serious or devastating setback