An entrepreneur is not a "startup founder". The goal of the entrepreneur is to create value (profit) and not sell to a venture capital fund. An entrepreneur looks around him/her and identifies "money on the table" opportunities.

You can recognize them by the fact that they solve often diverse problems around them. They see an opportunity and often take it, even though it sometimes is quite different than what they are usually doing. The loop of problem => opportunity => value creation is what tells them apart from median population. And of course how they work with risk.

They are rarely fixated on one area, it is more of a mindset and personality trait than a craft or expertise.