The Collaborative International Dictionary
Demonographer
Demonographer \De`mon*og"ra*pher\, n. [Demon + -graph + -er.]
A demonologist. [R.]
--Am. Cyc.
Wiktionary
demonographer
n. a demonologist
Usage examples of "demonographer".
If you ask them, they'll tell you they're gods, but most demonographers are uncomfortable with that appellation, and prefer to label them 'minor deities.