Nouns

(n)extremethe furthest or highest degree of something“he carried it to extremes”
(n)extreme point, extreme, extremumthe point located farthest from the middle of something

Adjectives

(s)extreme, utmost, uttermostof the greatest possible degree or extent or intensity“extreme cold”, “extreme caution”, “extreme pleasure”, “utmost contempt”, “to the utmost degree”, “in the uttermost distress”
(s)extremefar beyond a norm in quantity or amount or degree; to an utmost degree“an extreme example”, “extreme temperatures”, “extreme danger”
(s)extremebeyond a norm in views or actions“an extreme conservative”, “an extreme liberal”, “extreme views on integration”, “extreme opinions”
(s)extrememost distant in any direction“the extreme edge of town”