Aces and First class

First class and aces are semantically related In some cases you can replace phrase "First class" with "Aces", this terms are similar.

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

Aces and first class are semantically related in honorable topic. Sometimes you can use "Aces" instead an adjective phrase "First class", if it concerns topics such as excellent, amazing.