Mammoth Uncensored Word List:
88 words ending with h, 12 letters long

antibacklash arithmograph bandersnatch blabbermouth breakthrough breastplough buccaneerish butterscotch cathodograph centillionth chemoautroph clothesbrush commonwealth countermarch counterpunch counterweigh cryptobranch decilliardth dilettantish disembellish disestablish dissenterish drivethrough elasmobranch electroclash electrograph eleutherarch ellipsograph enantiomorph evaporograph flannelgraph gazetteerish hairsbreadth handsbreadth harmonograph homescreetch interborough keraunograph kettlestitch kletterschuh laryngograph magnetograph marconigraph meteorograph midsummerish multidigraph nonilliardth nutrientrich octilliardth opisthograph ornithomorph oscillograph overflourish overstrength phraseograph pollyannaish preestablish pythonomorph rephotograph scattergraph scattermouch schoolboyish septillionth seventyfifth sextillionth shavingbrush sixtyseventh snaggleteeth snaggletooth spectrograph sphygmograph squirrelfish steganograph subparagraph superstylish sycophantish synchroflash therethrough thunderflash tonsillolith trochelminth tsesarevitch tsesarewitch twentyfourth uncoquettish undernourish weathercloth wherethrough