I think the term "sphere" is clear enough, without a need for "perfect" to added in front. It is either a sphere or not. Consider a four sided object, if equal length lines with 90 degree corners, I'd call that a square. If lines or angles are off, I wouldn't call it squarish or almost a square. I'd call it a parallelogram, a rhombus, a trapezoid or a quadrilateral shape - or whatever it happened to be.
Being an artist, I perceive my world visually, and exact definitions when they are available should be used even in simple conversation to describe what we see. I'm not trying to be anal, I just call things as I see them and call them by their proper names, if I know them.
So you would never call anything a sphere, give that a perfect sphere does not exist in the universe (to our knowledge)? Is it just a word you would never, ever use?
[Physicists can correct me if I'm wrong about that - maybe singularities/black holes or something form perfect spheres!]