First class and Supreme

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

Supreme and first class are semantically related. in best topic. In some cases you can use "Supreme" instead an adjective phrase "First class", when it comes to topics like top, superior, excellent, first-rate.

Supreme adjective - Highest in rank or authority.

First class and supreme are semantically related. Sometimes you can use "First class" instead an adjective "Supreme".

Nearby Word: supremely