monotheist means A believer of monotheism, the doctrine that there is a single divine being in the universe. Lexicurio rates it Sui generis — a strength score of 86 out of 100.
Etymology
From mono- (“one, singular”) + theist (“believer in God or gods”) after the model of earlier atheist, polytheist, &c.
noun
- A believer of monotheism, the doctrine that there is a single divine being in the universe.