unitarian

As nouns the difference between doctrine and unitarian

is that doctrine is a belief or tenet, especially about philosophical or theological matters while unitarian is one who denies the doctrine of the trinity, believing that god exists only in one person; a unipersonalist.

As an adjective unitarian is

espousing a unitary view of something.

As adjectives the difference between unitary and unitarian

is that unitary is having the quality of oneness while Unitarian is pertaining to Unitarianism.

As nouns the difference between unitary and unitarian

is that unitary is a unitary council while Unitarian is a Christian who does not believe in the traditional doctrine of the Trinity.