Opticians rhymes with:
competition's, competitions, dietitian's, dietitians, mathematicians, partitions, petitions, politician's, politicians, politicians', repetitions, statisticians, superstitions, tacticians, theoreticians
competition's, competitions, dietitian's, dietitians, mathematicians, partitions, petitions, politician's, politicians, politicians', repetitions, statisticians, superstitions, tacticians, theoreticians