Mammonism is a term used to describe the worship of money and material possessions. It is closely related to the concepts of GREED and AVARICE, which are defined as an excessive or insatiable desire for wealth and material gain. GREED is typically characterized by a selfishness and lack of consideration for others, while AVARICE is often associated with a strong desire to acquire and hoard wealth. Both of these terms are commonly used to describe the behavior of those who prioritize money and material possessions over other values.