How does a "startup" differ from any other business? You write a business plan, invest some saved-up capital, work your ass off, charge for your product and hop

How does a "startup" differ from any other business? You write a business plan, invest some saved-up capital, work your ass off, charge for your product and hopefully bring in more money than you spend. To me, the only thing "startup" seems to imply is that you don't have a real business plan and a way to actually make money the way a "normal" business would, which doesn't seem that great.