G3021–λευκαίνω–leukainō

and his garments became glittering, white exceedingly, as snow, so as a fuller upon the earth is not able to whiten `them'.

λευκᾶναι. leukanai “to whiten.”

and I have said to him, `Sir, thou hast known;' and he said to me, `These are those who are coming out of the great tribulation, and they did wash their robes, and they made their robes white in the blood of the Lamb;

ἐλεύκαναν eleukanan “made white”