Here's what rhymes with stiffhess.
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says chef death fresh flesh deaf mesh rev ref neath breath afresh refresh cortege sense sex hence sets thence fence chefs hex vex steps defence defense gets cents deaths debts dense helps offence whence checks offense scarce tense threats dispense incense lets necks nets sects decks jets pence pets bets flex scents specks steppes vents wrecks refs reps sweats thefts vests effects events tests expense intense affects depths guests immense rests rents arrests belts nests suspense tents breaths chests desks epithets forgets melts pests temps tenths invests upsets begets cassettes dents descents infects invents jests pelts rosettes texts reflects respects accepts breasts lengths prevents cigarettes commence convex directs expects suspects bayonets pretense regrets selects attests bequests cadets clefts corrects crests detects elects intents sixpence adepts codex extents ferments minarets parapets perplex quests resents statuettes tempts vignettes suggests attempts requests strengths connects dialects presidents protects rejects collects neglects condense consents intersects laments alphabets digests intercepts penitents silhouettes tempests transepts represents manifests recompense commonsense intellects bottlenecks circumflex discontents quadriceps quartets architects multiplex commonwealths malcontents