13 letters
- restimulating21
- resuscitating20
- retranslating18
- retrospecting22
- revaccinating27
- reverberating23
- sandpaintings22
- scapegoatings24
- scintillating22
- sequestrating26
- sharpshooting23
- sidesplitting21
- somersaulting21
- speedboatings23
- sportscasting22
- sportswriting22
- stepparenting23
- stonecuttings21
- strangulating21
- subirrigating22
- subordinating22
- suffocatingly29
- supplementing28
- syllabicating26
- telecommuting27
- telemarketing24
- thermosetting21
- thermostating21
- titillatingly21
- translocating21
- transplanting22
- trapshootings21
- triangulating21
- uncalculating27
- undercoatings22
- undercounting24
- underpainting23
- underreacting22
- undershooting21
- undeviatingly26
- uninteresting19
- unrelentingly23
- unremittingly24
- vacillatingly28
- wainscottings23
- weightlifting27