First class and Good-looking

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

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

Good-looking adjective - Very pleasing to look at.

First class and good-looking are semantically related. Sometimes you can replace phrase "First class" with "Good-looking", this phrases are similar.