What is it called when you use two words to say the same thing?

On a technical level, 'redundancy (in the example) is accurate, but the cultural idiom would not fit. I.E. öh mama is making two trays of chicken for dinner."We don't say: öh mama is making two trays of "redundant chicken. That would be stupid,if not 'redundant. What mama does, is redundant. But don't blame it on the chicken. (shhh they are listening)