Synonyms for Compulsory

Synonyms starting with letter O

• obligatory

  required, mandatory, binding
• ordained
• of the essence
• obliging
• oblatory
• official
• obvious
• open and shut
• obdurate
• obstinate
• overhanging
• oppressive
• overweening
• obligate
• of vital importance
• orthodox
• open-and-shut
• overbearing
• ordered