9 letters
- proration13
- proscenia16
- protamine16
- protonate13
- protonema16
- purgation16
- raconteur14
- rainspout14
- reactions13
- reappoint16
- reception16
- recontact16
- recontour14
- reconvict20
- recouping19
- redaction14
- reduction15
- runcinate15
- stonecrop16
- succinate17
- suctorian14
- supinator14
- tenacious14
- truancies14
- uncertain15
- undercoat15
- uprooting16
- uptearing16