Pinnacle's rhymes with:
clinical's, chronicle's, chronicles, clinical's, technical's, technicals, agrochemicals, article's, bicycles, biologicals, biomedicals, chemical's, chemicals, chimicles, chronicle's, chronicles, clinical's, cubicles, cyclicals, electricals, encyclicals, evangelicals, follicles, icicles, musicals, optical's, periodicals, petrochemicals, pharmaceuticals, physicals, receptacles, sabbaticals, surgical's, technical's, technicals, testicles, vehicle's, vehicles, vehicles', vesicles
Pinnacle's sounds like:
pangels, pangloss, pencils, pennzoil's