First class and Primo

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

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

Primo adjective - Of the very best kind.

First class and primo are semantically related. Sometimes you can use "First class" instead an adjective "Primo".