Primetime rhymes with:
sometime, airtime, alltime, anytime, bedtime, centime, christmastime, daytime, dinnertime, downtime, everytime, flextime, fulltime, funtime, halftime, lifetime, longtime, lunchtime, maritime, mealtime, meantime, movietime, nighttime, noontime, overtime, parttime, pastime, peacetime, quicktime, ragtime, schooltime, showtime, sometime, springtime, summertime, wartime, wintertime
Primetime sounds like:
permutation, premeditation, premonition, printon, promethium, promotion, purinton