First class and Paramount

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

Paramount and first class are semantically related. in prime topic. In some cases you can use "Paramount" instead an adjective phrase "First class", when it comes to topics like best, better, top, most excellent.

Paramount adjective - Coming before all others in importance.

First class and paramount are semantically related. Sometimes you can use "First class" instead an adjective "Paramount".