extreme point vs extremum

extreme point and extremum both are nouns.

Word	Noun	Adjective	Verb	Adverb
extreme point	Yes	No	No	No
extremum	Yes	No	No	No

As nouns, extreme point and extremum are synonyms defined as:

extreme point and extremum: the point located farthest from the middle of something

Other synonyms of extreme point include extreme.

extreme point (noun)	extremum (noun)
the point located farthest from the middle of something	the point located farthest from the middle of something
	the most extreme possible amount or value