Some words starting with 'q' and ending in 's' which aren't also plurals or '-s' verbs are:
quoits (a throwing game)
Qantas (an Australian airline)
Quintus (a masculine given name, frequently indicating a fifth-born son or child)
quadratus (a quadrilateral muscle)
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queens
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Quil
Quaint is a 6 letter word that begins with the letter q and ends with t.
The country that starts with P and ends with S is Philippines.