From zeo; 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) -- emulation, envy(-ing), fervent mind, indignation, jealousy, zeal.

see GREEK zeo

ζῆλον (zēlon) − 4 Occurrences

ζῆλος (zēlos) − 8 Occurrences

ζήλου (zēlou) − 2 Occurrences

ζήλῳ (zēlō) − 3 Occurrences