Beyond the tools available in Moz Pro, do you have any recommendations on ways to figure out what those reasons might be? I'm a longtime web developer (although I didn't build this particular site), so I'm savvy with the technical end of things. I'm just relatively new to SEO (beyond the basics anyways).
To provide an example for this scenario, let's say the keyword is "Closet Organizers." My client domain would be superclosets.com and the competitor is closetorganizersystems.com. Not sure if that provides anymore insight with the domain thing, but I assumed it had some weight. Maybe not though.