heath, Keith, sheath, wreath, beneath, bequeath, underneath
'ate' or many of the words that have the 'ate' suffix
nat
Actually, nothing perfectly rhymes with complicated...BaitedBatedCoagulatedCollaboratedCommemoratedCompensatedConcentratedConfederatedConfiscatedConsolidatedConstipatedContaminatedContemplatedCooperatedCoordinatedCorroboratedDecoratedDemonstratedDenominatedDepopulatedDeterioratedElaboratedExoneratedHatedViolatedOverrated
Heath
teeth
Sheath and cones
Wreath,teeth,leaf
wreath and reef
gnash
teeth, heath, Sheath, Beneath,
gnash
Heath bar