What makes an entrepreneur different than an hourly or salary employee is their willingness to face challenges.
It is extremely difficult for a single person to create and grow a company since they need to oversee every aspect of their business's operations. Nearly all entrepreneurs have an Achilles' heel. If the entrepreneur comes from a maker background (meaning they are career individual contributors like engineers, writers, designers, etc.) then they may have challenges dealing with people such as employees, customers, investors, etc. On the other hand, if they're a "people person" with a background in management, then technical decisions might be their weak point.
The good entrepreneurs are the ones who recognize their shortcomings and work to improve themselves. But, regardless of an entrepreneur's background, it seems that marketing is always a challenge when venturing into new areas. No matter how good the idea, if you can't market it, it probably won't be successful.