Here's what rhymes with diuturnal.
journal eternal colonel kernel diurnal sternal vernal internal maternal paternal external fraternal infernal nocturnal Words that almost rhyme with diuturnal
dermal thermal geothermal epidermal isothermal hydrothermal purple turtle chervil burble burgle circle verbal fertile girdle servile hurdle myrtle puerperal gurgle curdle hurtle dispersal tubercle hurtful inertial deferral mirthful demurral disbursal commercial reversal referral rehearsal squirrel epidural infertile encircle illiberal scleral subdural clitoral forkful universal nonverbal bicameral conferral semicircle transversal infomercial transferal controversial noncommercial noncontroversial