First class and Valuable

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

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

Valuable adjective - Commanding a large price.

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

Nearby Words: value, valuing, valued, valuation, valuably