Pray :Pray means "to offer prayer to god". It also means to beg, plead,ask, entreat, request.
Prey :Prey term refers to "Victim". Prey also means to "Quarry", or to "Kill"
You must pray to God to help you in your distress.
Ramu always prays before going to bed.
Soman prayed to heal Shami soon.
Gyan prayed for his life.
He fell a prey to the mysterious disease and died within few hours.
Tiger Preyed the goat.
The deer fell Prey to the crocodile.