i Register
In some senses, computator is marked as archaic, humorous. Watch for register when choosing this word.
noun
A person who performs computations.
But this is an advantage not to be had by the biographer in this planet;—in the planet Mercury (belike) it may be so, if not better still for him;——for there the intense heat of the country, which is proved by computators, from its vicinity to the sun, to be more than equal to that of red-hot iron, […]
A mechanical device that performs computation.
Synonym of computer (“electronic device”).