Salam,
Dear Bro Sardar Miyan,
Allah clearly says in 39:42 where the words "wafat" and "maut" are both mentioned :
Allah takes the souls (yatawaffa l-anfusa) at the time of their death (mautiha), and those that do not die (lam tamut) [He takes] during their sleep. Then He keeps those for which He has decreed death (qadha 'alayha l-maut) and releases the others for a specified term. Indeed in that are signs for a people who give thought.
I hope that helps.
May God bless you.
Salam,