First class and Tip-top

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

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

Tip-top adjective - Of the very best kind.

First class and tip-top are semantically related. Sometimes you can use "First class" instead an adjective phrase "Tip-top".