G2121–εὔκαιρος–eukairos

And the chance came when Herod on his birthday gave a feast to his lords, and the high captains, and the chief men of Galilee;

εὐκαίρου eukairou “opportune”

Then let us come near to the seat of grace without fear, so that mercy may be given to us, and we may get grace for our help in time of need.

εὔκαιρον eukairon “in time of need”