What is the difference between jealousy and envy?
Jealousy is a lighter word than envy, which is darker.
Jealousy is usually used when it comes to a relationship: His girlfriend is jealous, she always stays with him.
Envy, as stated, is a darker word, and it's when you resent the success of the others: He envied his friend because he had a big house, beautiful family.
Envy is one of the sins, jealousy is not.
Jealousy is a developed form of envy. Envy is the primitive, unconscious sense of emptiness and privation. Recently, a Yale University School of Medicine psychiatrist, Frank John Ninivaggi, MD, has published the results of 35 years of study into envy. His book, Envy Theory: Perspectives on the Psychology of Envy sheds light on envy and interpersonal relationships. He speaks of love, hate, envy, and greed. This is a great resource on this obscure topic.