A 13-letter word that starts with "s" and ends with "s" is "schoolteachers."
Sandman (starts with S ends with N - 7 letter word)
An eight letter word that starts with S and ends with T: satiristshortestsmallestsmarteststagnantstalwartstiffeststridentsubtract
A word that starts with S and ends with X is sphinx.
The longest word that starts with an "s" and ends with an "r" is "supercomputer."
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screenplay
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salesmanshipscallopscholarshipsharpsheepshipshortstopsitupskipskycapsleepslumpsnowdropsoapsoupspaceshipsponsorshipstampsteamshipstepstickupstopstrapstripstumpswampsweepsyrup
A word that starts with S and ends with A: stigmata.
Scissors is an 8 letter word. It begins and ends with S.