Zealous or jealous
Zealous
Very keen and eager. Say: ZEL-us — buzzing z.
Priya is a zealous member of the eco club.
Jealous
Unhappy because someone has what you want. Say: JEL-us.
Rohan felt jealous of his friend's new bicycle.
Remember: Z is a long buzz, like a bee, with the tongue not touching. J starts with the tongue touching, then releases. Many speakers blend them — practise 'zero', 'zoo'.