11 letters
- oecumenical23
- omnipotence22
- omniscience22
- ontogenetic18
- orientation13
- pectination19
- penitential17
- penultimate20
- recommittal21
- reinoculate17
- reluctation17
- sentimental17
- stimulation17
- telecommute22
- telocentric19
- termination16
- testimonial16
- tiemannites16
- tumefaction22
- uncinematic23
- uncommitted23
- uncommonest23
- unconcealed22
- unemotional18
- uninucleate19
- untechnical23
- untimeliest17
- ventilation18