extremum vs acme

extremum and acme both are nouns.

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

As nouns, acme is a hyponym of extremum; that is, acme is a word with a more specific, narrower meaning than extremum:

Other hyponyms of extremum include apex, peak, vertex.

extremum (noun)	acme (noun)
the point located farthest from the middle of something	the highest point (of something)
the most extreme possible amount or value	the highest level or degree attainable; the highest stage of development