Regular rhymes with:
irregular, irregular, angular, equiangular, irregular, jugular, rectangular, singular, triangular, angular, annular, avuncular, binocular, cardiovascular, cellular, circular, curricular, equiangular, extracurricular, gastrovascular, globular, granular, intercellular, intermolecular, irregular, jocular, jugular, molecular, muscular, particular, perpendicular, popular, rectangular, secular, semicircular, singular, spectacular, testicular, triangular, tubular, unicellular, unpopular, unspectacular, vascular, vehicular, vernacular
Regular sounds like:
raisler, recycler, reichler, reseller, resler, ressler, riegler, rigler, rissler, roesler, roessler, rossler, ruseler, russler