This is not a trick question. It's about the difference between males and females in the roles as entrepreneurs. We have a perfectly acceptable Norwegian word for entrepreneur, which is entreprenør. Many would say gründer, but this is even less Norwegian. The gap (spalte, åpning, avstand) is a tad more complex, as any mention of gap in a male/female contexts makes you want to steer away from the first two. Hence, entreprenørmessig (or grundermessig) avstand, or forskjell.

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Note added at 2 hrs (2015-11-11 10:47:05 GMT)
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The phrase "The entrepreneurial gap between men and women" then translates into "den entreprenørmessige avstanden mellom menn og kvinner", "den entreprenørmessige forskjellen....", or "forskjellen mellom mannlige og kvinnelige entreprenører".