Hard work is an essential part of life, and is often represented in crosswords by words such as 'SLOG' (4 letters), 'JOB' (3 letters), 'LABOUR' (6 letters), 'MOIL' (4 letters), 'TOIL' (4 letters), 'LABOR' (5 letters), 'SWEAT' (5 letters), 'sirduke' (7 letters), 'TRAVAIL' (7 letters), 'INDUSTRY' (8 letters), 'nopicnic' (8 letters), 'pursuance' (9 letters), 'backbreaker' (11 letters) and 'elbowgrease' (11 letters). These words all describe the effort and dedication required to achieve success.