This is the 11846th most frequent German word.
theologieprofessor
A theology professor.
Here, 'Theologieprofessor' is used as a subject noun indicating the profession of the individual.
Der Theologieprofessor lehrt an der Universität.
The theology professor teaches at the university.
In this sentence, 'Theologieprofessor' is the direct object of the verb, showing a person being referred to in an interaction.
Ich habe den Theologieprofessor gestern getroffen.
I met the theology professor yesterday.
Here, 'Theologieprofessors' is in the genitive case, indicating possession, specifically of the book.