Lifetime rhymes with:
halftime, airtime, alltime, anytime, bedtime, centime, christmastime, daytime, dinnertime, downtime, everytime, flextime, fulltime, funtime, halftime, longtime, lunchtime, maritime, mealtime, meantime, movietime, nighttime, noontime, overtime, parttime, pastime, peacetime, primetime, quicktime, ragtime, schooltime, showtime, sometime, springtime, summertime, wartime, wintertime
Lifetime sounds like:
labaton, lefton, leptin, leviathan, levitan, levitation, leviton, levittown, liftin, lifton, lilliputian, lipton, lobotomy, loftin, lofton, lopatin, lupton