G2121–εὔκαιρος–eukairos

And when a convenient day was come, that Herod on his birthday made a supper to his lords, high captains, and chief estates of Galilee;

εὐκαίρου eukairou “opportune”

Let us therefore come boldly unto the throne of grace, that we may obtain mercy, and find grace to help in time of need.

εὔκαιρον eukairon “in time of need”