First class and Prime

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

Prime and first class are semantically related. in excellent topic. In some cases you can use "Prime" instead an adjective phrase "First class", when it comes to topics like good, pleasant, best, fine.

Prime adjective - Highest in rank or authority.

First class and prime are semantically related. You can use "First class" instead an adjective "Prime".

Nearby Words: primary, prim, primed, primal