10 letters
- incitation15
- incubation19
- indagation15
- indecision16
- indexation20
- indication16
- induration14
- infarction18
- infixation22
- inflection19
- infliction19
- infraction18
- ingression14
- inhalation15
- inhibition17
- inhumation18
- initiation12
- injunction26
- innovation17
- insolation13
- inspection18
- insulation14
- interunion14
- intimation15
- intinction16
- intonation13
- intubation16
- inundation15
- invitation16
- invocation19
- involution18
- iodination13
- ionization21
- irreligion14
- irrigation13
- irritation11
- jubilation25
- laceration15
- lamination16
- laureation13
- levigation18
- levitation16
- liberation15
- limitation15
- literation12
- litigation14
- lobulation17
- locomotion18
- lustration13
- maceration17
- maculation19
- marination15
- maturation15
- medication18
- meditation15
- midsection18
- miscaption20
- misprision17
- mitigation16
- moderation15
- modulation17
- morulation16
- motivation18
- multiunion18
- mutilation16
- navigation18
- nodulation15
- nomination16
- nonfiction19
- nucleation17
- numeration16
- obligation17
- obturation15
- occupation21
- opposition17
- oppression17
- ordination13
- osculation16
- outstation12
- overaction18
- pagination17
- palliation16
- patination15
- peculation19
- perception20
- percussion18
- perfection20
- perihelion17
- permeation17
- permission17
- peroration14
- persuasion15
- perversion18
- pincushion21
- pixilation22
- plantation16
- population19
- possession14
- postillion16
- precaution18
- precession17
- preclusion19
- prediction18
- preemption20
- prehension17
- prelection18
- preportion17
- pretension15
- prevention19
- procession17
- production19
- profession17
- projection26
- proportion17
- propulsion19
- protection17
- protrusion15
- punctation19
- quaternion22
- recitation14
- recreation14
- redemption18
- redivision16
- reelection15
- reemission14
- reflection18
- refraction17
- refutation15
- regression13
- regulation15
- reignition14
- reinvasion16
- relaxation19
- relegation14
- relocation15
- renovation16
- reparation14
- repetition14
- reposition14
- repression14
- reputation15
- rescission14
- resolution13
- resorption14
- resumption18
- retraction14
- revelation16
- revocation18
- revolution17
- rumination16
- salivation16
- salutation13
- sanitation12
- saturation12
- separation14
- septillion16
- sextillion20
- sibilation15
- simulation16
- sonication15
- spallation16
- speciation17
- spoliation15
- squamation24
- stagnation14
- starvation15
- subduction20
- subjection27
- submersion18
- submission18
- subreption18
- subsection18
- substation15
- subvention20
- subversion19
- succession18
- suggestion16
- supination16
- suppletion19
- surjection24
- suspension16
- tabulation16
- television16
- temptation17
- titivation15
- toleration12
- trabeation14
- trajection23
- transition12
- trisection14
- triskelion16
- truncation16
- ulceration16
- undulation16
- urtication15
- usurpation16
- validation17
- vegetation17
- veneration16
- vermillion20