Shoddy and Second class

Shoddy adjective - Of low quality.

Second class and shoddy are semantically related In some cases you can replace phrase "Second class" with "Shoddy", this terms are similar.

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

Shoddy and second class are semantically related in low topic. Sometimes you can use "Shoddy" instead an adjective phrase "Second class", if it concerns topics such as inferior, mediocre.