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