Doctor vs theologiser

Doctor and theologiser both are nouns.

Word	Noun	Adjective	Verb	Adverb
Doctor	Yes	No	No	No
theologiser	Yes	No	No	No

As nouns, theologiser is a hypernym of Doctor; that is, theologiser is a word with a broader meaning than Doctor:

Doctor: (Roman Catholic Church) a title conferred on 33 saints who distinguished themselves through the orthodoxy of their theological teaching
theologiser: someone who is learned in theology or who speculates about theology

Other hypernyms of Doctor include theologian, theologist, theologizer.

Doctor (noun)	theologiser (noun)
(Roman Catholic Church) a title conferred on 33 saints who distinguished themselves through the orthodoxy of their theological teaching	someone who is learned in theology or who speculates about theology