apex vs empyrean

apex and empyrean both are nouns.

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

apex (noun)	empyrean (noun)
the highest point (of something)	the apparent surface of the imaginary sphere on which celestial bodies appear to be projected
the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars

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