A spatula in cooking is a flat object often made of rubber or metal meant to spread, mix or lift food.
A flipper or turner are flat objects usually made of metal or plastic designed to slide under a piece of food in a pan or on a grill. The broad flat blade facilities easy turning of the food. (Flipper sounds more like a colloquialism for turner to me. Also Pancake Flipper or Burger Flipper is frequently used to refer to the person doing the flipping - that is a short-order cook …)
Rubber (or silicone) spatulas with handles are also called scrapers. (With no handle they are called bowl scrapers.)
Small metal spatulas are often called icing knives.
A spatula can refer to any tool with a small flat blade. It is derived directly from Latin, having come to English in the 1520s as a medical instrument. Spatula the diminutive of the Latin spatha meaning a "broad, flat tool or weapon," from Greek spathe "broad flat blade (used by weavers)".
Based upon my review of multiple cook's tool resellers (Williams-Sonoma, etc.) it seems that turners are frequently called spatulas. And, rubber scrapers are also called spatulas. But, a rubber scraper cannot be called a turner, and vice-versa.