class act vs apotheosis

class act and apotheosis both are nouns.

Word	Noun	Adjective	Verb	Adverb
class act	Yes	No	No	No
apotheosis	Yes	No	No	No

As nouns, apotheosis is a hypernym of class act; that is, apotheosis is a word with a broader meaning than class act:

class act: someone who shows impressive and stylish excellence
apotheosis: model of excellence or perfection of a kind; one having no equal

Other hypernyms of class act include ideal, nonesuch, nonpareil, nonsuch, paragon, saint.

class act (noun)	apotheosis (noun)
someone who shows impressive and stylish excellence	the elevation of a person (as to the status of a god)
	model of excellence or perfection of a kind; one having no equal