A word for someone who is obsessed with money is "miser" or "avaricious."
Miser: A miser is someone who hoards and saves money excessively, often at the expense of their own well-being or the well-being of others. They may be excessively frugal and reluctant to spend money on even basic needs.
Avaricious: Avaricious is an adjective used to describe someone who has an extreme desire for wealth and is excessively greedy for money and material possessions.
Both terms describe individuals who place an overwhelming focus on accumulating and retaining wealth, often at the expense of other aspects of life, such as relationships, personal growth, or generosity towards others.