Theres no difference really, you can use them interchangeably. There is subtle subtext though. Earning money suggests more hard work, whereas you can make money through good investments and luck.

Make money means you have put your money into something that would generate more money. It is as if your money is put to work like a laborer. Earn money is when you work to generate the money for you. For example, you find a job, get hired, work regularly day to day or any other time interval, then your employer would pay your salary. So you did the work, you got paid! You earned a pay check!😀

Make money: 1. Invest your capital to make a profit and lose money. 2. It refers specifically to profit, making money. 3. Refers to making money, such as doing a day's work and earning tens of dollars. Earning money: mainly refers to the exchange of labor for money. It can be seen that making money includes making money and making money exists in making money.

Open" and "open up" can often be used interchangeably, but there are some subtle differences in their meanings and usage: Open: This is a verb that means to move something (like a door, window, lid, etc.) so that it no longer covers an opening. It can also mean to make something accessible or available for use or participation. For example: "Please open the door." "The store opens at 9:00 AM." Open up: This phrasal verb has a similar meaning to "open," but it often implies a broader or more figurative sense of opening. It can mean to become more communicative, honest, or receptive. For example: "He opened up about his feelings." "The discussion opened up new possibilities." In summary, while "open" typically refers to physically moving something to reveal what is behind it or to make something accessible, "open up" can refer to both physical actions and more abstract concepts like becoming more open emotionally or intellectually.

Any time that you say ‘earn’ you can replace it with ‘make’. It’s more general and colloquial. I earn/make a living as an engineer. I’m earning/making/getting 5% on my CDs. There are ways of making money for which we wouldn’t use ‘earn’. This can have a value judgement in that we don’t approve of it, or that it has a chance element, or that it’s not regular. Jeff Bezos makes way too much money. My brother makes more money playing poker than he earns at his job. I used the money I made from the sale of my first house to make a down payment on my second.