LATIN DICTIONARYLexicon Latīnum
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“demon” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

demon
Evil spirit, daemon (Lactantius 2, 44, sqq.): diabolus (a devil; διάβολος, Eccl.): one who expels demons, *qui diabolos expellit ac fugat: (if by exorcism) exorcista (Eccl.).
A good or bad spirit, Genius, or genius comes (Hor.).

Quick answer

What is the Latin word for demon?
The usual Latin words for “demon” are daemōn, diabolus, exorcista; also genius. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.