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Synonyms for Working-class (same or very similar meaning)

WordNet sense 1 (working for hourly wages rather than fixed (e.g. annual) salaries):

WordNet sense 2 (of or designating manual industrial work or workers):
blue-collar, blue-collar

WordNet sense 3 (of those who work for wages especially manual or industrial laborers):

WordNet sense 4 (occupying the lowest socioeconomic position in a society):
lower-class, low-class

From the ODE community, based on WordNetadd/edit