10 letters
- polythenes19
- salicylate17
- salmonella17
- sanctimony20
- scallopini19
- semantical18
- semilethal17
- septennial16
- septicemia19
- septillion16
- simoniacal18
- societally17
- solacement18
- spallation16
- speciality19
- speciation17
- synaloepha19
- synoptical20
- tailpieces17
- tailplanes16
- talismanic18
- telephonic20
- thiaminase16
- thylacines19