The report was based on March 2016 US data from SEMrush's database of more than 80 million keywords.
The researchers looked at the average price paid per click and removed terms with a competition score of less than 0.3.
The most expensive Google AdWords keyword combination is "best mesothelioma lawyer" ($935.71). Mesothelioma is a cancerous tumor that is at the center of many asbestos-related lawsuits.
Terms related to lawyers or lawsuits account for 78% of the top 100 most expensive terms, and nine of the top 10.
About the research: The report was based on March 2016 US data from SEMrush's database of more than 80 million keywords.
Ayaz Nanji is an independent digital strategist and a co-founder of ICW Content, a marketing agency specializing in content creation for brands and businesses. He is also a research writer for MarketingProfs. He has worked for Google/YouTube, the Travel Channel, AOL, and the New York Times.
LinkedIn: Ayaz Nanji