theologian vs St. John Chrysostom

theologian and St. John Chrysostom both are nouns.

Word	Noun	Adjective	Verb	Adverb
theologian	Yes	No	No	No
St. John Chrysostom	Yes	No	No	No

theologian (noun)	St. John Chrysostom (noun)
someone who is learned in theology or who speculates about theology	(Roman Catholic Church) a Church Father who was a great preacher and bishop of Constantinople; a saint and Doctor of the Church (347-407)