theologian vs preterist

theologian and preterist both are nouns.

Word	Noun	Adjective	Verb	Adverb
theologian	Yes	No	No	No
preterist	Yes	No	No	No

As nouns, preterist is a hyponym of theologian; that is, preterist is a word with a more specific, narrower meaning than theologian:

theologian: someone who is learned in theology or who speculates about theology
preterist: a theologian who believes that the Scripture prophecies of the Apocalypse (the Book of Revelation) have already been fulfilled

theologian (noun)	preterist (noun)
someone who is learned in theology or who speculates about theology	a theologian who believes that the Scripture prophecies of the Apocalypse (the Book of Revelation) have already been fulfilled