17 letters
- invulnerabilities29
- irreformabilities27
- irrefragabilities26
- irreparablenesses25
- irrepealabilities25
- irresistibilities21
- irreversibilities25
- irrevocablenesses29
- kindheartednesses27
- lepidopterologies28
- levelheadednesses28
- longsightednesses27
- lymphadenopathies35
- magnanimousnesses29
- maintainabilities26
- maneuverabilities30
- marriageabilities26
- meaninglessnesses26
- mellifluousnesses29
- merchantabilities30
- meritoriousnesses22
- microencapsulates32
- micromorphologies34
- microphotometries31
- microseismicities29
- microsporogeneses29
- microvasculatures33
- mischievousnesses31
- mistrustfulnesses27
- monospecificities33
- monosyllabicities31
- mountainousnesses25
- multibillionaires28
- multimillionaires28
- nearsightednesses24
- necessitousnesses23
- neurofibromatoses28
- neurophysiologies29
- neuropsychiatries29
- neuropsychologies32
- nonavailabilities28
- nonbelligerencies30
- nonbiodegradables30
- noncontemporaries29
- nonflammabilities33
- nonsensicalnesses25
- nucleophilicities32
- obstructivenesses29
- odoriferousnesses23
- openheartednesses25
- openmouthednesses29
- opinionatednesses24
- opprobriousnesses28
- orthopsychiatries29
- overfamiliarities28
- oversensitivities26
- overzealousnesses33
- paradoxicalnesses33
- paraformaldehydes33
- pathophysiologies32
- perfunctorinesses29
- permissiblenesses28
- persnicketinesses29
- perspicuousnesses29
- pestiferousnesses25
- pharisaicalnesses27
- pharmacotherapies33
- phenylethylamines35
- phosphoglycerates35
- phototelegraphies30
- physiopathologies32
- picturesquenesses35
- pithecanthropines32
- plainspokennesses31
- pleasurablenesses27
- plenipotentiaries26
- plethysmographies35
- practicablenesses31
- precipitantnesses28
- precipitatenesses27
- precipitousnesses28
- prejudicialnesses36
- presentablenesses26
- prestigiousnesses24
- pretentiousnesses23
- programmabilities32
- progressivenesses27
- prohibitivenesses30
- promiscuousnesses29
- proportionalities25
- provocativenesses32
- pseudopregnancies32
- psychobiographies37
- psychopathologies35
- psychosexualities36
- punctiliousnesses28
- purposelessnesses26
- pyroelectricities29
- quarrelsomenesses32
- quatercentenaries32
- radioautographies26
- radiotelegraphies26
- recognizabilities36
- reconcilabilities29
- refrangiblenesses28
- rememberabilities30
- remorselessnesses22
- repetitiousnesses22
- reproachfulnesses31
- reproducibilities29
- resourcefulnesses27
- respectablenesses28
- responsiblenesses26
- restrictivenesses25
- roentgenographies28
- roundheadednesses25
- rudimentarinesses24
- rumbustiousnesses27
- saponaceousnesses26
- semidocumentaries29
- semipornographies31
- sententiousnesses21
- serviceablenesses29
- sesquicentenaries32
- softheartednesses24
- spontaneousnesses24
- standoffishnesses28
- stereochemistries25
- stereomicroscopes29
- straitlacednesses23
- subordinatenesses24
- substantialnesses24
- substantivenesses27
- superbillionaires27
- superefficiencies34
- superfluousnesses28
- superintendencies28
- superlativenesses27
- supermillionaires27
- superplasticities28
- suppressibilities28
- suppressivenesses29
- susceptiblenesses29
- suspensefulnesses28
- swellheadednesses27
- symmetricalnesses30
- synchronousnesses28
- telephotographies30
- temerariousnesses22
- tempestuousnesses26
- tendentiousnesses22
- thermochemistries30
- thermostabilities26
- thoughtlessnesses26
- tightfistednesses26
- transferabilities25
- translatabilities23
- transparentnesses23
- transubstantiates23
- treacherousnesses24
- triiodothyronines24
- triphenylmethanes32
- troublesomenesses26
- trueheartednesses22
- trustworthinesses24
- ultraprogressives28
- ultrasonographies27
- unacceptabilities32
- unalterablenesses25
- unanswerabilities27
- unassailabilities24
- unchangeabilities31
- unclimbablenesses34
- unconcernednesses29
- unconsciousnesses28
- underhandednesses26
- undesirablenesses25
- unemployabilities32
- unendurablenesses27
- unfavorablenesses31
- unforgivingnesses32
- uninhibitednesses27
- unmelodiousnesses26
- unmitigatednesses26
- unobtrusivenesses28
- unrighteousnesses25
- venturesomenesses27
- viscoelasticities28
- warmheartednesses27
- warrantablenesses26
- wrongheadednesses28
- xeroradiographies32