Sand * star * shut * stop * seem * sell * sand * seen
shut
oats
spit
An eight letter word that starts with S and ends with T: satiristshortestsmallestsmarteststagnantstalwartstiffeststridentsubtract
im not sure about a 7 letter word, but i do know i 8 letter word that starts with s and means the right to vote, the word is... sufferage.
swim
That would be the word size.
SUSSEX
shut
oats
witswenswarswagswayswedswigswetswinswoeswuss
sore
Sperm
Sire
s for seek
Some four letter words beginning with P and ending with S:PadsPalsPansPapsParsPassPatsPawsPaysPeasPecsPegsPensPepsPetsPewsPicsPiesPigsPinsPipsPitsPlusPodsPolsPomsPopsPotsProsPubsPudsPugsPunsPupsPuts
Surf, serf, self.