theologian vs Saint Ambrose

theologian and Saint Ambrose both are nouns.

Word	Noun	Adjective	Verb	Adverb
theologian	Yes	No	No	No
Saint Ambrose	Yes	No	No	No

theologian (noun)	Saint Ambrose (noun)
someone who is learned in theology or who speculates about theology	(Roman Catholic Church) Roman priest who became bishop of Milan; the first Church Father born and raised in the Christian faith; composer of hymns; imposed orthodoxy on the early Christian church and built up its secular power; a saint and Doctor of the Church (340?-397)