Non-U and Working-class

Non-U adjective - Not characteristic of the upper classes especially in language use.

Working-class and non-U are semantically related. In some cases you can use "Working-class" instead an adjective phrase "Non-U".

Working-class adjective - Working for hourly wages rather than fixed (e.g. annual) salaries.

Non-U and working-class are semantically related. You can use "Non-U" instead an adjective phrase "Working-class".