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.
The word Mollusk is a 7 letter word.
Inimical comes to mind, but I'm sure there are others. I can do you one letter better: a 7 letter word that contains three Is is "idiotic".
pass out how about 'slumber'? im not sure if it refers to a deep kind of sleep, but it has 7 letters and it is sleep :)
Papyrus- it is an ancientEgyptian version of paper(I am 97% sure it is correct)
The 7 letter word is "Capsule"
"SIAMESE", although I'm not sure it's politically correct.
These words I am not to sure about: douleiamoineaueutopiamiaoudadoulieeucosiaeunomiaThese ones 100% sure:sequoiaeulogia
Ability is a 7 letter word.
pontoon
A 7-letter word for barely boiled is "poached".
Can't get a 7 letter word with only 6 letters. The 6 letter word is DESIST.