9 letters
- officinal20
- olfaction17
- operation13
- oratories9
- oratrices12
- orientate10
- orificial16
- originate12
- outercoat13
- overtrain14
- partition13
- patriotic15
- pretorian13
- procreant16
- proration13
- protector15
- protonate13
- raconteur14
- raffinose16
- rainproof16
- ratifiers12
- ratooners10
- rattooned11
- reactions13
- reconfirm19
- recontact16
- recontour14
- recrating15
- rectifier15
- rectorate12
- rectorial13
- redaction14
- refection16
- refitting15
- reflation14
- refortify17
- refractor15
- reinforce16
- reliction14
- renovator14
- reroofing15
- resonator10
- restraint10
- retinitis10
- retirants10
- retorting12
- retracing15
- retractor12
- retroacts12
- retrodict13
- retrofits12
- rhinoceri15
- rotations10
- rotatores9
- scarifier15
- serration10
- sortition10
- stationer10
- striation10
- tackifier19
- taconites13
- tariffing18
- tarriance13
- terracing15
- thriftier14
- throatier11
- tiffanies16
- titration10
- tolerator10
- tormentor13
- torrified13
- torrifies12
- tortricid13
- tractions13
- tradition11
- transfect16
- trattorie9
- tretinoin11
- triatomic15
- trichinae15
- triclinia14
- tricornes13
- tricotine13
- trifectas15
- trilinear11
- trinities10
- trisector12
- triticale13
- ventifact20
- vitiation14