St. Athanasius vs theologian

St. Athanasius and theologian both are nouns.

Word	Noun	Adjective	Verb	Adverb
St. Athanasius	Yes	No	No	No
theologian	Yes	No	No	No

St. Athanasius (noun)	theologian (noun)
(Roman Catholic Church) Greek patriarch of Alexandria who championed Christian orthodoxy against Arianism; a church father, saint, and Doctor of the Church (293-373)	someone who is learned in theology or who speculates about theology