The two terms (variate"variate" and deviate)"deviate" appear to be interchangeable according to:
a random variable is a measurable function from a probability space to a measurable space of values that the variable can take on. In that context, and in statistics, those values are known as a random variates, or occasionally random deviates[1]
[1] https://en.wikipedia.org/wiki/Random_variate. (3/8/2018)