Lower class and Low-class

Lower class noun - The social class lowest in the social hierarchy.

Low-class and lower class are semantically related. In some cases you can use "Low-class" instead an adjective phrase "Lower class".

Low-class adjective - Occupying the lowest socioeconomic position in a society.

Lower class and low-class are semantically related. Sometimes you can replace phrase "Lower class" with "Low-class", this phrases are similar.