A person who envies someone is often referred to as an "envious" individual. This term describes someone who feels resentment or discontent due to another person's advantages, possessions, or qualities. Additionally, such a person might be called a "jealous" individual, although jealousy can also imply a fear of losing something to someone else.
Envious.
The person is a blackmailer.
can you call someone a welth of knowledge
a person
A person?
You call that person a scholar.
an ally
You would call them someone who peruses.
You can call someone who does not lie honest, truthful, trustworthy, or sincere.
someone who works for a business
You can call someone who is wise and has good sense as a sage or a wise person.
If someone tries to make you feel jealous.You must call that person a despo or a looser and a jerky person.