extremist

As a noun extremist

is extremist.

As an adjective overexuberant is

excessively exuberant.

As nouns the difference between ideology and extremist

is that ideology is doctrine, philosophy, body of beliefs or principles belonging to an individual or group while extremist is extremist.

As nouns the difference between extremist and militant

is that extremist is extremist while militant is (obsolete) a soldier, a combatant.

As an adjective militant is

fighting or disposed to fight; belligerent, warlike.

As nouns the difference between hardliner and extremist

is that hardliner is while extremist is extremist.

As nouns the difference between extremist and terrorists

is that extremist is extremist while terrorists is .

As nouns the difference between extremist and bigot

is that extremist is extremist while bigot is (derogatory) one who is obstinately or intolerantly devoted to his or her own opinions and prejudices.

As an adjective idealist

is .

As a noun extremist is

extremist.

As nouns the difference between jacobin and extremist

is that jacobin is jacobin while extremist is extremist.

As an adjective jacobin

is jacobin.

As nouns the difference between extremist and fundamentalism

is that extremist is extremist while fundamentalism is (religion) the tendency to reduce a religion to its most fundamental tenets, based on strict interpretation of core texts.

As nouns the difference between humor and extremist

is that humor is mood, temper while extremist is extremist.