Jocular rhymes with:
binocular, avuncular, binocular, cardiovascular, circular, curricular, extracurricular, gastrovascular, intermolecular, molecular, muscular, particular, perpendicular, secular, semicircular, spectacular, testicular, unspectacular, vascular, vehicular, vernacular
Jocular sounds like:
jailer, jeweler, jewelry, jollier, juggler, jugular