Menial and Second class

Menial adjective - Showing, expressing, or offered in a spirit of humility or unseemly submissiveness.

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

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

Menial and second class are semantically related in poor topic. Sometimes you can use "Menial" instead an adjective phrase "Second class".