10 letters
- rabbinical21
- racemizing28
- radiogenic17
- radiolabel16
- radiologic17
- ramblingly23
- reavailing18
- reblooming20
- rebuilding19
- reclaiming20
- recoloring17
- recoupling21
- redialling16
- redoubling19
- regionally17
- regulation15
- relabeling18
- relational13
- relocating17
- relocation15
- relumining19
- replumbing24
- republican22
- retinacula16
- rigamarole16
- rollicking22
- rosemaling17
- sarcolemma20
- scrambling23
- seaborgium19
- seignorial14
- simoniacal18
- slumbering21
- subceiling21
- subcooling21
- subglacial21
- subliminal20
- submanager20
- subminimal22
- summerlong21
- summonable22
- tambourine18
- tambouring20
- tourbillon17
- tourmaline16
- tramelling18
- trammeling20
- trigeminal17
- trilingual16
- turmoiling18
- ufological21
- ulcerating18
- ulceration16
- ultraclean17
- umbilicals22
- umbilicate21
- unarguable19
- unbecoming24
- unbiblical23
- uncommoner22
- unfamiliar19
- ungainlier16
- unicameral19
- unilateral14
- unilocular18
- unoriginal16
- unreliable17
- unscalable20
- unscramble22
- unsociable19
- upclimbing27
- urbanology20
- urogenital15
- urological18
- vermillion20
- zabaglione26