First class and Unequaled

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

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

Unequaled adjective - Having no equal or rival for excellence or desirability.

First class and unequaled are semantically related. Sometimes you can use "First class" instead an adjective "Unequaled".