theologian vs Gerhard Gerhards

theologian and Gerhard Gerhards both are nouns.

Word	Noun	Adjective	Verb	Adverb
theologian	Yes	No	No	No
Gerhard Gerhards	Yes	No	No	No

theologian (noun)	Gerhard Gerhards (noun)
someone who is learned in theology or who speculates about theology	Dutch humanist and theologian who was the leading Renaissance scholar of northern Europe; although his criticisms of the Roman Catholic Church led to the Reformation, he opposed violence and condemned Martin Luther (1466-1536)