Here's what rhymes with sistersister.
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sifter whisper swifter lifter snifter drifter crisper filter victor fitter sitter hitter hinter hipster figure winter silver bitter finger hither litter singer sinner thicker thinker thinner thither vigor filler fissure shiver vicar shipper simmer fiercer fisher shimmer spinster zipper assignor fixer minster sicker sinker whisker fritter kilter scissor titter vintner zither cyder disinter kisser river differ dinner liver mirror nearer bigger liquor printer richer hinder killer pillar whither winner emitter fixture flicker giver glitter linger mixer nigger pitcher rigor sphincter stricter bidder dearer miller skipper splinter swimmer tiller wicker wither cinder digger dimmer slipper sliver spinner sticker stiffer thriller tinker trickster critter dipper expositor kicker picker reenter ringer ticker wisher bicker chiller chipper dither flipper jigger pilfer pincer quitter rigger skimmer slicker slimmer slither snicker sprinter stinger twitter wringer consider familiar picture mixture deliver timber clearer trigger builder quicker transmitter ginger predictor tincture beginner configure drinker glimmer quiver clipper elixir timbre tinder upriver vizier whimper babysitter bringer clinker disfigure embitter limber stringer stripper trimmer distiller driller freethinker grimmer gripper guilder prefigure scribbler winder scripture admixture stricture caterpillar constrictor lawgiver midwinter sprinkler bewilder downriver clincher scrivener teleprinter transfigure unfamiliar reconsider discomfiture quicksilver franchisor gravedigger neurotransmitter