Mammoth Uncensored Word List:
46 words ending with h, 13 letters long

accelerograph addressograph anemobiagraph aneroidograph anthropomorph centilliardth chemautotroph chromatograph cinematograph dilettanteish featherstitch fingerbreadth guttersnipish gynandromorph hystricomorph kaffeeklatsch kinematograph lamellibranch leprechaunish liebfraumilch marsipobranch nemathelminth opisthobranch otherworldish overembellish perennibranch phonautograph platyhelminth porcupinefish pseudepigraph quadrillionth quintillionth rechoreograph reflectograph rontgenograph sansculottish schoolgirlish schoolmarmish schwarmerisch sedecillionth septilliardth sextilliardth straightforth superstrength twopenceworth understrength