theologian vs Geert Geerts

theologian and Geert Geerts both are nouns.

Word	Noun	Adjective	Verb	Adverb
theologian	Yes	No	No	No
Geert Geerts	Yes	No	No	No

theologian (noun)	Geert Geerts (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)