O death (thanate). Second instance. Here Paul changes Hades of the lxx for Hebrew Sheol (Hos 13:14) to death. Paul never uses Hades.
Thy sting (sou to kentron). Old word from kentreō, to prick, as in Act 26:14. In Rev 9:10 of the sting of locusts, scorpions. The serpent death has lost his poison fangs.