12 letters
- immovability28
- immutability25
- impenetrable23
- impenetrably25
- imperishable24
- imperishably26
- imponderable24
- imponderably26
- imputability25
- inappeasable23
- inapplicable27
- inapplicably29
- incalculable26
- incalculably28
- incapability25
- incommutable27
- incommutably29
- incomparable26
- incomparably28
- incomputable27
- incomputably29
- inconsolable22
- inconsolably24
- inconsumable25
- inconsumably27
- incorporable23
- indeclinable23
- indefinables22
- indisputable22
- indisputably24
- ineffability25
- ineffaceable26
- ineffaceably28
- ineradicable21
- ineradicably23
- inexplicable31
- inexplicably33
- inexpugnable31
- inexpugnably33
- inextricable27
- inextricably29
- inflammables27
- inhabitation19
- inhospitable22
- inhospitably24
- inseparables20
- insufferable24
- insufferably26
- insurability20
- interminable21
- interminably23
- invulnerable24
- invulnerably26
- irredeemable20
- irredeemably22
- irreformable22
- irrefragable21
- irrefragably23
- irremediable20
- irremediably22
- irrepealable20
- irresolvable21
- irritability18
- jettisonable26
- labanotation18
- labiodentals19
- laboratories16
- labradorites17
- labyrinthian22
- labyrinthine22
- laudableness20
- leachability24
- likabilities21
- livabilities21
- lovabilities21
- magnetizable31
- maintainable21
- malleability23
- maneuverable25
- marriageable21
- mechanizable34
- memorability24
- merchantable25
- metabolizing31
- microhabitat23
- microwavable29
- mislabelling24
- modulability24
- monosyllabic26
- monosyllable24
- movabilities23
- mutabilities20
- navigability25
- nonabsorbent21
- nonabstracts20
- nonadiabatic21
- nonbreakable25
- noncrushable24
- nondiabetics21
- nondisableds20
- nonflammable28
- nonmalleable23
- nonrenewable22
- nonrepayable23
- nonreusables19
- normalizable30
- notabilities17
- octosyllabic25
- octosyllable23
- opposability24
- overabstract22
- overabundant23
- overlaboring23
- palatability22
- paraboloidal21
- permeability24
- photolyzable33
- pickabacking35
- pitiableness20
- pliabilities20
- polysyllabic28
- polysyllable26
- postabortion19
- potabilities19
- precipitable25
- prediabetics22
- preestablish21
- prefabricate24
- pregnability24
- printability22
- probabilisms25
- probabilists22
- programmable27
- prosecutable23
- provableness24
- psychobabble32
- pulverizable34
- quantifiable30
- questionable27
- questionably29
- rabbinically26
- radiolabeled19
- readableness18
- readjustable27
- rechargeable23
- recognizable31
- recognizably33
- reconcilable24
- registerable18
- rehabilitant19
- rehabilitate18
- rehydratable21
- reimbursable23
- reinhabiting21
- reliableness18
- rememberable25
- removability25
- renegotiable19
- renewability22
- reproachable24
- reputability22
- researchable21
- respectables22
- restabilized26
- restabilizes25
- restrainable17
- rhabdocoeles22
- rhabdomancer25
- rockabillies24
- sabermetrics21
- salabilities17
- sanctionable21
- saponifiable23
- scabrousness20
- scarabaeuses19
- sedimentable21
- semiabstract21
- separability21
- severability22
- sewabilities19
- shabbinesses21
- shareability20
- sociableness20
- stablenesses17
- stablishment22
- stainability19
- strabismuses19
- subdividable26
- suitableness18
- summarizable32
- superabounds22
- supercabinet23
- superposable23
- surmountable22
- syllabically26
- syllabicated23
- syllabicates22
- syllabifying27
- tabernacling23
- tabernacular21