13 letters
- preinductions23
- premeditation21
- prenomination22
- preoccupation27
- preordination19
- preportioning23
- prepositional21
- prepossession20
- preproduction25
- prerevolution23
- prescriptions23
- preselections21
- presentations18
- preservations21
- prestigiously22
- pretelevision22
- pretensioning21
- pretentiously21
- pretermission20
- prevarication24
- prevocational25
- privatization30
- probationally24
- processionals21
- processioning23
- proclamations24
- professionals21
- progressional20
- projectionist29
- proliferation21
- prolongations21
- promulgations24
- pronunciation23
- propitiations20
- proportionals21
- proportionate20
- proportioning23
- propositional21
- propositioned21
- proprioceptor25
- proscriptions23
- prostitutions18
- protectionism23
- protectionist20
- protestations17
- provisionally25
- psychobiology31
- pulverization32
- punctiliously26
- purifications24
- putrefactions24
- pyrheliometer24
- quadrillionth29
- qualification31
- quantitations25
- quantizations34
- quasiperiodic30
- questionaries24
- questionnaire25
- quindecillion31
- quintillionth29
- racemizations29
- radiationless16
- radioactively24
- radioactivity23
- radiobiologic23
- radiochemical26
- radiochemists22
- radioelements19
- radiographies21
- radiographing24
- radioisotopes17
- radioisotopic20
- radiolabeling22
- radiolabelled21
- radionuclides21
- radiothoriums20
- ramifications23
- randomization28
- rapaciousness21
- rarefactional21
- ratifications20
- ratiocinating20
- ratiocination18
- ratiocinative21
- ratiocinators17
- rationalising18
- rationalistic18
- rationalities15
- rationalizers24
- rationalizing27
- reacquisition27
- reactionaries17
- reactivations21
- reaffirmation23
- reaggregation20
- reallocations19
- reannexations23
- reapplication24
- reapportioned21
- reassumptions21
- reattribution18
- recalculation23
- recalibration21
- receptionists20
- reciprocation23
- recirculation22
- recollections22
- recombination24
- recommissions23
- recompilation24
- recomposition23
- recomputation24
- reconceptions24
- reconditioned20
- reconnections22
- reconversions22
- reconvictions25
- recreationist17
- recrimination21
- rectification23
- recuperations21
- redecorations18
- rededications19
- redefinitions19
- redemptioners21
- redescription21
- redisposition18
- reductionisms22
- reductionists19
- reduplication23
- reescalations18
- reevaluations20
- reexamination25
- reexportation24
- reforestation17
- reformational21
- reformulation22
- refoundations20
- refrigeration19
- regenerations17
- regimentation20
- regionalistic20
- regionalizing29
- registrations16
- regurgitation19
- reimportation20
- reimpositions20
- reimpressions20
- reincarnation19
- reinfestation18
- reinnervation20
- reinoculation20
- reinspections21
- reintegration17
- rejuvenations29
- relationships20
- religiosities16
- religiousness18
- relubrication22
- remonstration18
- remotivations21
- remunerations19
- renationalize25
- renaturations16
- renegotiation17
- renominations19
- renunciations20
- reoccupations24
- reorientation15
- repartitioned18
- repatriations17
- repercussions21
- repetitiously20
- replantations19
- repopulations22
- repositioning20
- repossessions17
- reprehensions20
- repressionist17
- reproductions22
- reprovisioned22
- republication25
- repunctuation23
- requisitioned25
- reregulations18
- resegregation18
- restimulation19
- resubmissions21
- resurrections18
- resuscitation18
- reticulations19
- retranslation16
- retrocessions17
- retrodictions18
- retroflection21
- retroflexions25
- retrogression16
- retrospection20
- retroversions18