keyword

https://www.spyfu.com/outreach/top-lists/keyword/3

http://www.wordstream.com/articles/most-expensive-keywords

http://grepwords.com/1000000-top-high-paying-cpc-adwords-adsense-keywords-2015/

https://www.pagerank.net/high-paying-keywords/

https://www.mytipshub.com/top-adsense-high-paying-keywords/

https://roadtoblogging.com/high-paying-keywords-for-google-adsense/

https://www.google.co.in/search?q=roji&oq=roji&aqs=chrome..69i57j69i60l2j69i61j0l2.2462j0j7&sourceid=chrome&ie=UTF-8#q=The+best+paying+keyword&*