11 letters
- occultation20
- octagonally21
- oligochaete19
- oncological22
- ontogenetic18
- ontological19
- orientating15
- orientation13
- oscillating19
- oscillation17
- outcatching23
- outcheating20
- outcoaching23
- pectination19
- penological22
- phonetician21
- phonotactic23
- pollinating20
- pollination18
- potlatching23
- ratiocinate15
- reallotting16
- reattaching19
- reattaining15
- recantation16
- recognition18
- reconciling22
- retaliating15
- retaliation13
- rheological20
- ricocheting22
- rototilling16
- scintillant18
- scintillate17
- sinological19
- stencilling20
- tantalising16
- tantalizing25
- technically24
- technicians21
- technologic23
- teratologic17
- tetanically19
- thanatology19
- theologians17
- theological20
- thiocyanate19
- titanically19
- tonetically19
- untechnical23
- vacationing22
- vaccinating25
- vaccination23
- vacillating23
- vacillation21
- ventilating20
- ventilation18