When someone is feeling jealous, they are often feeling envious as well (Psychology Today)

Jealousy and envy are often considered synonymous, but the words don’t truly mean the same thing.

“One might almost say that these two words are used as if they were interchangeable … The words are scarcely synonymous, however. Envymeans discontented longing for someone else’s advantages. Jealousy means unpleasant suspicion, or apprehension of rivalship.  
—Theodore M. Bernstein, The Careful Writer, 1965

There are three different ways in which jealous can be used. The most common is … where the meaning is “fearful of losing attention.” Another broad sense is “possessive” or “protective” … third usage is in the sense of “envious,” as of another person because of his or her belongings, abilities, or achievements.  
—William and Mary Morris, Harper Dictionary of Contemporary Usage (2nd ed.), 1985

Jealousy is properly restricted to contexts involving emotional rivalry; envy is used more broadly of resentful contemplation of a more fortunate person.  
—Bryan A. Garner, Garner’s Modern American Usage (3rd ed.), 2009″

https://www.merriam-webster.com/words-at-play/jealous-vs-envious

Jealousy is a feeling of resentment, bitterness, or hostility toward someone who has something that you don’t.

Envy is a negative feeling of desire centered on someone who has something that you do not.

https://www.dictionary.com/e/jealousy-vs-envy/

The main difference between envy and jealousy is that envy is the emotion of coveting what someone else has, while jealousy is the emotion related to fear that something you have will be taken away by someone else.

Example: I envy her possessions or situation. I am jealous that you like her over me.

https://www.diffen.com/difference/Envy_vs_Jealousy

Envy is when we lack a desired attribute enjoyed by another, whereas jealousy is when something we have is threatened by a third person.

https://www.psychologytoday.com/us/blog/joy-and-pain/201401/what-is-the-difference-between-envy-and-jealousy

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