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)
queens
Quickly,
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.
quotes
queens
The word is "souq."
queenq kivi
QUINCE
Quickly,
Nope
quigelj
quail
Quil
qualcomm
There are no valid English word that starts with J and ends with Q. For reference, here are all the words that end with Q but none start with J: suq. tranq. umiaq. qepiq.