What does hot keyword's score mean?

The score field is an option for prioritizing your hot keywords. It is calculated based on keywords’ search volume potential and the likelihood for your website to get higher rankings in Google for a given keyword.

The higher the score is, the more traffic a keyword can potentially bring you when you get into Google’s Top 10.

10 is the highest score, 1 is the lowest, so you will want to pay attention to the suggestions with a higher score first.