heavens vs empyrean

heavens and empyrean both are nouns.

Word	Noun	Adjective	Verb	Adverb
heavens	Yes	No	No	No
empyrean	Yes	Yes	No	No

As nouns, heavens and empyrean are synonyms defined as:

heavens and empyrean: the apparent surface of the imaginary sphere on which celestial bodies appear to be projected

Other synonyms of heavens include celestial sphere, firmament, sphere, vault of heaven, welkin.

heavens (noun)	empyrean (noun)
the apparent surface of the imaginary sphere on which celestial bodies appear to be projected	the apparent surface of the imaginary sphere on which celestial bodies appear to be projected

heavens (adjective)	empyrean (adjective)
	of or relating to the sky or heavens
	inspiring awe