כָּהַן kâhan (H3547)

to officiate as a priest; figuratively, to put on regalia

1) to act as a priest, minister in a priest's office 1a) (Piel) 1a1) to minister as a priest, serve as a priest 1a2) to be or become a priest 1a3) to play the priest

a primitive root, apparently meaning to mediate in religious services; but used only as denominative from כֹּהֵן (H3548);