apex vs acme

apex and acme both are nouns.

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

As nouns, apex and acme are synonyms defined as:

Other synonyms of apex include peak, vertex.

apex (noun)	acme (noun)
the highest point (of something)	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	the highest level or degree attainable; the highest stage of development