extremum vs extreme

extremum and extreme both are nouns.

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

As nouns, extremum and extreme are synonyms defined as:

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

Other synonyms of extremum include extreme point.

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

extremum (adjective)	extreme (adjective)
	most distant in any direction
	far beyond a norm in quantity or amount or degree; to an utmost degree
	of the greatest possible degree or extent or intensity
	beyond a norm in views or actions