Here's what rhymes with heaviest.
Words that almost rhyme with heaviest
fleshiest fleshliest dressiest veriest airiest cheviot hairiest edgiest variant pettiest scariest sexiest sketchiest wariest heftiest smelliest peppiest sweatiest tetchiest zestiest leggiest teariest chariot wealthiest deadliest lariat homeliest emptiest lengthiest cerement stealthiest peskiest stretchiest testiest preppiest invariant friendliest recreant comeliest cleanliest prescient commissariat unfriendliest uncleanliest secretariat proletariat