First class and Shipshape

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

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

Shipshape adjective - Being clean and in good order.

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