extremist

As nouns the difference between extremist and nonextremist

is that extremist is a person who holds extreme views, especially one who advocates such views; a radical or fanatic while nonextremist is one who is not an extremist.

As adjectives the difference between extremist and nonextremist

is that extremist is holding extreme views, especially on a political subject while nonextremist is not extremist.

As nouns the difference between extremist and environazi

is that extremist is extremist while environazi is (pejorative) environmentalist, usually with extremist views.