Here are several ways of going broad:
- Use thesaurus.com to find synonyms for your main terms.
- Use the Google AdWords Keyword Tool. …
- Wordtracker.com is a useful tool that provides keyword suggestions.
- Spy on your competition. …
- Make a list of categories, brands, and any other classifications of products you sell or promote.
For More Information Please Refer: https://www.seo.com/blog/how-to-create-a-huge-keyword-list/