שָׂר

From LSJ

ἀγάπης δὲ οὐδὲν μεῖζον οὔτε ἴσον ἐστίnothing is greater or equal to love

Source

English (Strong)

from שָׂרַר; a head person (of any rank or class): captain (that had rule), chief (captain), general, governor, keeper, lord, ((-task-))master, prince(-ipal), ruler, steward.