"Monopoly" literally means there is only one player in the market, or that one player has a hugely dominant position.
If the suggested "Cartel" doesn't work, there's also "Oligopoly"[0]
If the suggested "Cartel" doesn't work, there's also "Oligopoly"[0]
"Market Failure" is the word you're looking for. And there's LOTS of ways to achieve Market Failure.
Your vocabulary of economic terms is limited and imprecise. If you study economics more, you'll certainly appreciate the amount of work that the field has put into definitions and policies.
These details are important, especially in a democracy where we voters are the ones who ultimately decide upon the fate of our country. We all have to have basic economic knowledge of these Market Failure conditions, as well as the policies available to combat them.