First class and Stoner

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

Stoner and first class are semantically related. In some cases you can use "Stoner" instead an adjective phrase "First class".

Stoner noun - A person who regularly uses drugs especially illegally.

First class and stoner are semantically related. Sometimes you can use "First class" instead an adjective "Stoner".