The ABC or Alphabet Soup method of search is a fast way to generate thousands of keywords. The method can be used on Google, Bing, eBay, Amazon, Target, Walmart and many other such sites. DMOZ has shut down so no reason to go to that site.
Don't forget YouTube where there is terrific traffic.
Such websites are visited by billions of visitors everyday. If you use JAAXY, then you can click on Alphabet Soup and start your search. It will cover the whole alphabet automatically. You can then click a keyword to see the number of monthly visitors, the expected traffic if you land on the first page of Google, the number of competitive sites and the SEO power.
https://ubersuggest.io/ will give you keywords in the order of the ABC Method. You can find a zillion keywords there.
You can make 30 Free Keyword searches at http://jaaxyaffiliatekeywordtool.com/
John