11 letters
- extirpation22
- extradition20
- extrication22
- fabrication21
- fascination19
- fecundation21
- fimbriation21
- fluctuation21
- fomentation19
- forestation15
- formulation20
- fornication19
- frustration16
- fulguration20
- fulmination21
- fustigation18
- germination18
- granulation17
- gratulation16
- gravitation18
- habituation18
- hibernation18
- humiliation19
- hyphenation22
- hypolimnion24
- hypotension20
- idolization23
- illuviation19
- imagination18
- imbrication21
- immigration20
- impartation18
- impetration18
- implication22
- importation18
- imprecation21
- imprecision21
- inattention14
- incantation17
- incarnation17
- inclination18
- inculcation21
- inculpation21
- incurvation21
- indentation15
- indigestion16
- indignation17
- indirection17
- inebriation16
- infatuation17
- infestation16
- information19
- infuriation17
- innervation18
- inoculation18
- inquisition23
- inscription19
- insinuation15
- inspiration16
- instigation15
- institution14
- instruction17
- integration15
- interaction16
- interfusion17
- irradiation13
- itemization24
- itineration13
- jactitation24
- laciniation17
- lacrimation19
- laicization25
- lamentation17
- legislation16
- lionization23
- liposuction20
- liquidation24
- lixiviation24
- lubrication20
- lucubration21
- machination21
- malediction20
- malefaction22
- malfunction24
- malposition19
- manumission20
- margination18
- mastication18
- melioration16
- mensuration17
- mercuration19
- metafiction21
- methanation18
- methylation20
- metrication18
- micturition19
- miscitation18
- miscreation18
- misdivision20
- misfunction23
- mislocation19
- misposition18
- molestation16
- multination18
- negotiation15
- neurulation16
- nondecision18
- nonelection18
- nonsolution16
- obfuscation22
- objurgation27
- obscuration19
- observation19
- obstruction19
- occultation20
- officiation21
- orientation13
- origination15
- oscillation17
- ostentation13
- overcaution20
- oviposition19
- oxygenation24
- ozonization31
- palpitation19
- parturition16
- passivation19
- pectination19
- penetration16
- percolation19
- perennation17
- perforation18
- permutation19
- persecution19
- personation16
- pollination18
- posttension16
- postulation17
- predication19
- preelection19
- preignition18
- preinvasion20
- prelibation19
- premonition19
- premunition20
- preparation18
- preposition18
- presumption22
- proabortion18
- procreation18
- procuration19
- profanation19
- progression17
- prohibition20
- propagation20
- proposition18
- prorogation17
- prosecution19
- prostration15
- protonation16
- protraction18
- provocation22
- publication23
- pullulation20
- punctuation21
- pustulation18
- quadrillion25
- quintillion25
- rapscallion20
- rarefaction18
- reaccession18
- readmission16
- realization22
- reanimation16
- reapportion18
- reassertion12
- recantation16
- reclamation19
- recognition18
- recondition17
- recordation16
- redigestion15
- redirection16
- reeducation17
- reformation18
- rehydration17
- reification18
- reinfection19
- reinflation17
- reinjection25
- reinsertion13
- reinvention18
- reiteration12
- reluctation17
- remediation16
- remigration17
- reoperation15
- reoxidation20
- repartition15
- replication19