First class and Tiptop

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

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

Tiptop adjective - Of the highest quality.

First class and tiptop are semantically related. Sometimes you can use "First class" instead an adjective "Tiptop".