First class and Refined

First class noun - Mail that includes letters and postcards and packages sealed against inspection.

Refined and first class are semantically related. in excellent topic. In some cases you can use "Refined" instead an adjective phrase "First class".

Refined adjective - Being far along in development.

First class and refined are semantically related. Sometimes you can replace phrase "First class" with "Refined", this terms are similar.

Nearby Words: refinement, refining, refiner