handsomenessharmlessnesshelplessnesshomelessnesshopelessnesshorribleness
harness
helmets
sixteenth, squeamish
H12345s
Sasquatch, sixteenth, squeamish
That's heavenly.
A 13-letter word that starts with "s" and ends with "s" is "schoolteachers."
Harum's
An eight letter word that starts with S and ends with T: satiristshortestsmallestsmarteststagnantstalwartstiffeststridentsubtract
Sandman (starts with S ends with N - 7 letter word)
A word that starts with S and ends with X is sphinx.