12 letters
- fianchettoed22
- fluphenazine33
- forecheckers27
- forechecking30
- foregathered20
- forgathering22
- fountainhead21
- freewheelers21
- freewheeling24
- furtherances22
- galactorrhea20
- garnisheeing20
- gauchenesses21
- gegenscheins23
- geochemistry24
- geothermally23
- gnatcatchers23
- godfathering23
- goosefleshes20
- grandfathers21
- grandmothers21
- grandnephews25
- greathearted17
- greenfinches24
- groundfishes22
- groundsheets19
- guitarfishes20
- haberdashers20
- haberdashery22
- hagiographer23
- hamantaschen24
- hardheadedly22
- headforemost21
- headlessness17
- headmistress18
- headquarters25
- headshrinker22
- heartbreaker21
- heartburning22
- hearteningly21
- hearthstones17
- heartinesses15
- heartrending19
- heartstrings17
- heartwarming23
- heathenishly22
- heathenizing29
- heavenliness21
- heavyhearted23
- heavyweights27
- hebdomadally26
- hebephrenias23
- hebephrenics26
- hebetudinous21
- hebraization27
- hectographed25
- hedgehoppers25
- hedgehopping28
- heedlessness17
- heldentenors18
- helicoptered22
- heliocentric22
- heliographed23
- heliographic25
- heliolatries16
- heliolatrous17
- heliotropism21
- hellaciously23
- hellgrammite24
- helmsmanship27
- helplessness20
- hemangiomata23
- hematogenous21
- hematologies20
- hematologist20
- hematoxylins28
- hemerocallis22
- hemerythrins22
- hemichordate23
- hemihydrated23
- hemihydrates22
- hemimorphism28
- hemodialyses21
- hemodialysis21
- hemodilution21
- hemodynamics27
- hemophiliacs26
- hemoproteins21
- hemorrhaging24
- hemorrhoidal21
- hemosiderins19
- hemstitchers22
- hemstitching25
- henceforward25
- henotheistic20
- hepatomegaly25
- heraldically23
- herbicidally25
- hereditament19
- hereditarian16
- hereditarily18
- hereinbefore21
- heritability20
- hermeneutics22
- hermetically24
- hermeticisms23
- heroicomical24
- herringboned22
- herringbones21
- hesitatingly20
- heteroauxins23
- heterocercal21
- heteroclites18
- heterocycles23
- heterocyclic26
- heterodoxies22
- heteroduplex27
- heterodyning21
- heteroecious18
- heteroecisms20
- heterogamete19
- heterogamety21
- heterogamies19
- heterogamous20
- heterogenies17
- heterogenous18
- heterogonies17
- heterografts19
- heterokaryon21
- heterologous18
- heteronomies18
- heteronomous19
- heterophylly25
- heteroploids19
- heteroploidy21
- heterosexual23
- heterotrophs19
- heterotrophy21
- heterozygote27
- heterozygous28
- hexadecimals29
- hexahydrates26
- hexaploidies26
- hexobarbital28
- hobblebushes27
- holographers22
- homeothermic25
- homoiotherms22
- honeybunches27
- horsefleshes20
- hotchpotches27
- housefathers20
- housemothers20
- hydrographer24
- hydrospheres22
- hydrospheric25
- hydrotherapy24
- hydrothermal23
- hypersthenes22
- hypersthenic25
- hyperthermia24
- hyperthermic27
- hyphenations23
- hypnotherapy27
- hypothecated25
- hypothecates24
- hypothecator24
- hypothenuses23
- hypothermias24
- hypothesized31
- hypothesizes30
- hypothetical25
- iconographer23
- icosahedrons19
- impoverished25
- impoverisher24
- impoverishes24
- incoherences22
- incoherently22
- ingatherings20
- inheritances19
- inheritrices18
- inheritrixes22
- isothermally21
- kinesthesias19
- kitchenettes22
- kitchenwares25
- knuckleheads29
- largehearted18
- leatherbacks25
- leatherettes15
- leathernecks23
- leatherwoods19
- lighthearted20
- lithographed23
- lithographer22
- lithospheres20
- lithospheric23
- lockstitched26
- lockstitches25