10 letters
- octahedron17
- octameters16
- octarchies18
- optatively20
- orangutans15
- orientally15
- orientated12
- orientates11
- ornamental16
- outachieve20
- outarguing17
- outstaring14
- outstarted12
- outstating14
- outstation12
- outstaying16
- outtalking19
- outtasking18
- overbrutal19
- overstaffs20
- overstated15
- overstates14
- overstayed17
- overtaking21
- overtalked20
- overtasked19
- overtaxing24
- paclitaxel25
- palatalize24
- palmitates17
- palpitated18
- palpitates17
- pantalones16
- pantaloons16
- paratactic19
- parentages16
- parentally18
- patentable18
- pedestaled16
- pedimental19
- pentagonal18
- pentagrams19
- pentahedra17
- pentameter17
- pentangles18
- pentaploid19
- pentathlon18
- pentatonic18
- percentage19
- permutable21
- pertaining17
- petalodies15
- phantasied17
- phantasies16
- phantasmal20
- phantasmic22
- photostats15
- phototaxes22
- phototaxis22
- phyllotaxy28
- pigmentary21
- pikestaffs23
- pikestaves21
- pistachios18
- pistareens14
- pitapatted17
- placentals19
- planetaria15
- plantation16
- pocketable24
- poetasters13
- pollutants17
- ponytailed18
- portabella18
- portabello18
- portamenti17
- portamento17
- portapacks23
- postarrest13
- postatomic19
- postattack20
- postcoital17
- potability19
- potassiums17
- potentates14
- precontact20
- prefrontal18
- pregenital17
- premarital17
- prenatally18
- prestamped20
- pretasting16
- prodromata17
- profitable20
- profitably22
- promotable20
- prostatism16
- protamines17
- protectant17
- protestant14
- protistans14
- protostars13
- provitamin21
- psittacine17
- ptarmigans19
- punctation19
- puritanism18
- putatively21
- quadrantal23
- quantitate21
- quittances24
- quotations21
- razzmatazz49
- reactances17
- reattached16
- reattaches15
- reattacked18
- reattained12
- rebuttable18
- receptacle20
- recitalist14
- recitation14
- recitative17
- recitativi17
- recitativo17
- recontacts17
- rectangles17
- reductants16
- reductases15
- refutation15
- regimental17
- reinstalls13
- reinstated12
- reinstates11
- reluctance19
- reluctancy21
- reluctated16
- reluctates15
- remittable17
- remittance17
- reobtained15
- repeatable17
- repentance18
- reportable17
- reportages15
- reputation15
- resectable17
- resettable14
- resistance14
- resistants11
- restacking20
- restaffing19
- restamping19
- restarting13
- restaurant12
- resultants13
- retackling21
- retailings14
- retailored12
- retaliated12
- retaliates11
- retardants12
- retardates11
- retargeted13
- retreatant11
- revegetate16
- revertants15
- revitalise15
- revitalize24
- rheostatic15
- rijsttafel23
- ritardando13
- rotameters13
- rotational12
- rotatively17
- roundtable17
- roustabout15
- rudimental17
- sabotaging18
- sacahuista16
- sacerdotal15
- sacristans14
- sagittally16
- saltarelli13
- saltarello13
- saltations12
- salutarily15
- salutation13
- salutatory14
- samaritans14
- sanitarian12
- sanitaries11
- sanitarily14
- sanitarium15
- sanitating14
- sanitation12
- scleromata17
- sectarians14
- segmentary18
- selectable18