Here's what rhymes with kerplump.
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drummed plumbed lunch blunt plunge summed brunt hummed lunge numbed brunch gummed thumbed runt front fund bunch hunt punch shunt affront grunt hunch shunned crunch cunt gunned punt tongued benumbed bunt gerund munch confront sponge stunned refund succumbed stunt rotund jocund fecund waterfront expunge riverfront battlefront cup pulp sup cusp gulp pup workup closeup buttercup