13 letters
- enjoyableness30
- entanglements22
- epileptically27
- epileptogenic26
- equablenesses28
- equipollences32
- equipollently32
- equitableness28
- equivalencies32
- establishable23
- estimableness21
- exceptionable31
- excitableness28
- excusableness29
- execrableness28
- exhaustlessly27
- extrasystoles23
- faithlessness20
- farkleberries24
- faultlessness20
- favorableness25
- fencelessness22
- ferroelectric23
- fertilenesses18
- feuilletonism23
- feuilletonist20
- flexibilities28
- flexographies31
- foreknowledge28
- fortuneteller20
- fruitlessness19
- generalizable30
- gentlemanlike26
- gentlepersons21
- genuflections25
- gleefulnesses22
- gobbledegooks29
- gobbledygooks31
- godlessnesses18
- gracelessness20
- gracilenesses20
- graphitizable33
- guilelessness19
- guiltlessness19
- gutlessnesses18
- habitableness23
- haplessnesses20
- harlequinades28
- heartlessness17
- hellenization28
- homeschoolers24
- honorableness21
- housecleaning24
- houselessness18
- huckleberries27
- humorlessness21
- hydroelectric25
- hypervirulent27
- ignoblenesses21
- immovableness28
- immutableness25
- imperceivable30
- imperceptible29
- imperishables25
- impermissible26
- imperturbable27
- imponderables25
- impracticable29
- inappreciable27
- incalescences25
- incapableness25
- incombustible28
- incompatibles27
- inconceivable29
- incontestable22
- inconvertible26
- inconvincible30
- incorrigibles23
- incorruptible25
- indefatigable24
- indescribable25
- indigestibles21
- indiscernible23
- indispensable23
- indissociable22
- ineffableness25
- inexhaustible28
- inexplainable30
- inexpressible28
- inflexibility31
- influenceable27
- infusibleness23
- insolubleness21
- insupportable25
- insusceptible25
- intellections20
- intellectuals21
- interelectron19
- intermeddlers20
- interoperable21
- interparticle21
- interpleaders19
- interpleading22
- interpretable21
- interruptible22
- inveiglements25
- invisibleness23
- irascibleness21
- irreclaimable24
- irrecoverable24
- irrelevancies22
- irreplaceable24
- irrepressible20
- irresponsible21
- irretrievable21
- irritableness18
- isoelectronic21
- joblessnesses27
- joylessnesses26
- kaleidoscopes25
- kaleidoscopic28
- kleptomaniacs28
- knowledgeable29
- knowledgeably31
- knuckleballer32
- knuckleheaded31
- laughableness24
- lawlessnesses19
- learnednesses17
- leatherleaves21
- lecherousness21
- legalizations27
- legislatively24
- legislatorial18
- legitimations20
- legitimatized29
- legitimatizes28
- leishmaniases20
- leishmaniasis20
- leisureliness17
- lengthinesses20
- lepidopterans22
- lepidopterist21
- lepidopterous22
- leprechaunish26
- leptocephalus27
- leptospiroses20
- leptospirosis20
- lethargically25
- letterboxings27
- letterpresses17
- letterspacing23
- lexicographer31
- lexicographic34
- lexicologists27
- likablenesses23
- limitlessness19
- livablenesses23
- losablenesses19
- lovablenesses23
- lysolecithins23
- macromolecule28
- mademoiselles22
- manipulatable26
- meaninglessly24
- memorableness24
- mercilessness21
- metabolizable33
- metronidazole28
- microcapsules27
- microelements24
- microfilmable30
- microparticle26
- microwaveable30
- middleweights26
- millennialism24
- millennialist21
- mineralizable31
- mischannelled26
- miserableness21
- misknowledges28
- mollycoddlers26
- monocotyledon25
- monomolecular26
- mononucleated24
- mononucleoses23
- mononucleosis23
- monosyllables25
- movablenesses25
- multibarreled23
- multinucleate24
- multiparticle25
- multitalented21
- multivalences27
- multivariable26
- myelencephala29
- myoelectrical26
- myrmecophiles30
- needleworkers23
- nervelessness20