The term "rent-seeking" is accurate within the study of economics, but is bound not to be understood accurately by lots of non-economists. It resembles a competing, everyday meaning that is inocuous: buying a property or other asset and renting it out is a valuable service, whereas "rent-seeking" is destructive. The term is economists' jargon that euphemizes the problem. If I were the chief of the rent-seeking lobby, I would want everyone to keep calling it "rent-seeking."
The term "economic central planning" emphasizes that it's fundamentally opposite to free market economics, and that its practitioners and defenders are hypocrites.
Except that the terms "economic central planning" and "rent seeking" are orthogonal, even if the results are the same. You could, in theory, have economic central planning without rent seeking -- though it may not work that way in practice.
I think the above poster had it correct; refer to it as "crony capitalism" to non-economists.
The term "economic central planning" emphasizes that it's fundamentally opposite to free market economics, and that its practitioners and defenders are hypocrites.