Whenever you do an organic search, there are typically only a few keywords you enter into a search engine. The search engine then checks whether the keywords can be found on a web site. The better the match between the keywords you’re looking for and the web site, the higher the web site appears on the result page. Different tools can help determine the right keywords.
Keywordtool.io lets you see keywords that match an item or pair of items. Check to see whether the suggested keywords match your web site. The benefit here is that keyword suggestions are adjusted to fit the different search engines.
Google AdWords’ Keyword Planner offers you more opportunities for differentiation using a filter and by eliminating certain keywords. Keep in mind that Keyword Planner is only applicable to Google itself. Google AdWords does however have the advantage of letting you see the search volume of a keyword.