ζῆλος
zēlos
dzay'-los
from ζέω; properly, heat, i.e. (figuratively) "zeal" (in a favorable sense, ardor; in an unfavorable one, jealousy, as of a husband (figuratively, of God), or an enemy, malice).

KJV translates as: emulation, envy(ing), fervent mind, indignation, jealousy, zeal