First class and Most

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

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

Most adjective - Of the greatest or highest degree or quantity.

First class and most are semantically related. Sometimes you can use "First class" instead an adjective "Most".

Nearby Word: mostly