empyrean vs apex

empyrean and apex both are nouns.

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

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

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