Canary and Second class

Canary adjective - Having the color of a canary; of a light to moderate yellow.

Second class and canary are semantically related. In some cases you can use "Second class" instead an adjective "Canary".

Second class noun - Not the highest quality in a classification.

Canary and second class are semantically related. Sometimes you can use "Canary" instead an adjective phrase "Second class".