10 letters
- occasional18
- octillions16
- octonaries14
- olecranons16
- olfactions18
- oligoclase17
- operations14
- oratorical14
- orientally15
- orthoclase16
- oscillated16
- oscillates15
- oscillator15
- osculation16
- ostensoria11
- overaction18
- palliators15
- placations18
- placentals19
- pleonastic18
- pollinates16
- pollinator16
- porcelains18
- pratincole18
- prolactins18
- rationales12
- rationally15
- reallocate15
- redactions15
- reflations15
- reinstalls13
- relational13
- relaxation19
- relictions15
- relocating17
- relocation15
- resolution13
- resorcinol15
- retinacula16
- revocation18
- ritornello13
- rotational12
- sacerdotal15
- sailboater14
- sailplaner16
- salicylate17
- saltarelli13
- saltarello13
- saltcellar16
- scarlatina15
- scleromata17
- sclerotial15
- sclerotins15
- sectarians14
- sectionals15
- semantical18
- senatorial12
- senatorian12
- separation14
- sinoatrial12
- societally17
- solenoidal14
- solonetzic24
- spallation16
- stenciller16
- sterically17
- tailplanes16
- tamarillos15
- tarriances14
- tolerances15
- toleration12
- tractional15
- trainloads13
- ulceration16
- ultraclean17
- ultrasonic16
- unilateral14
- vacationer18
- vacillates19
- vacillator19
- varicellas19
- vocational19
- vorticella19
- zoolatries20