Noontime rhymes with:
centime, downtime, funtime, meantime, airtime, alltime, anytime, bedtime, centime, christmastime, daytime, dinnertime, downtime, everytime, flextime, fulltime, funtime, halftime, lifetime, longtime, lunchtime, maritime, mealtime, meantime, movietime, nighttime, overtime, parttime, pastime, peacetime, primetime, quicktime, ragtime, schooltime, showtime, sometime, springtime, summertime, wartime, wintertime
Noontime sounds like:
nadein, nadine, nandaime, natan, nathan, nathania, nathene, nation, natuna, nayden, needham, neoteny, netan, netanyahu, newton, newtonian, newtown, newtowne, nineteen, nodine, nomination, notation, nothin, nothin', notion, nowotny, nutone, nydam