This is a really cool feature in ahrefs that will find all of the keywords that a site is currently ranking for.
This list I provide contains all keywords that ahrefs finds for a domain and that are currently ranked 20 or higher on Google.
I dont claim this list to be complete, but it tends to find most relevent keywords and can give you a real insight into what your competitors are ranking for or trying to rank for.
provide keywords for 3 domains
Provide a list of organic keywords that are currently ranking for up to 3 seperate domains
- SEO Report