Here's what rhymes with smoothest.
Words that almost rhyme with smoothest
loosest obtusest profusest newest nudest fewest rudest coolest soonest shrewdest duellist hugest lewdest movement student unit mutant fluent tumult coolant crudest annuitant bluest cruelest canoeist prudent mouvement souvent truant intuit oculist rootlet bassoonist sunhat amusement pursuant inducement adjuvant imprudent impudent pollutant cartoonist diluent entombment insouciant gruesomest improvement confluent disputant recruitment translucent quadruplet