Lowborn and Second-class

Lowborn adjective - Belonging to the class of people of low social or economic rank.

Second-class and lowborn are semantically related. in poor topic. In some cases you can use "Second-class" instead an adjective "Lowborn".

Second-class adjective - Of little or less value or merit.

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