Jealous (Adjective) = Envious of another’s advantages.
Synonyms: Covetous, Emulous, Envious, Intolerant.
Example: You should not be jealous of your brother.
Zealous (Adjective) = Enthusiastic.
Synonyms: Avid, Fervent, Passionate, Spirited.
Example: He is so zealous about the IPL games.