Hard labor is a term used to describe physical work that is difficult and often unpleasant. TOIL, which is four letters, is defined as hard or exhausting labor. GRIND, which is five letters, is defined as tedious and difficult work. MOIL, which is also four letters, is defined as to TOIL or labor hard. DRUDGERY, which is eight letters, is defined as hard, menial, or dull work. Sweatofonesbrow, which is fifteen letters, is defined as hard labor or work that requires a lot of effort.