profiteer
noun [ C ]
disapproving uk/ˌprɒfɪˈtɪər/ us COMMERCE
a person or organization that takes unfair advantage of a situation to make a large profit, often by selling goods that are difficult to get at a very high price:
Humanitarian aid such as cans of oil were resold by war profiteers.
profiteer
verb [ I ]
Unscrupulous operators are scheming to profiteer at homeowners' expense.