Google Keyword Planner

Google/Youtube/Bing/Amazon/eBay/Play Store/Instagram/Twitter

When product layout keywords, you can use this tool to query whether the keywords have other names

If you want more traffic to your site or want to better understand what your market is looking for you should explore Wordtracker.

It's a bit like an introduction to a word in a dictionary. I usually use this tool to write articles that are semantically related. For example, if the topic of an article is about weight loss, then I actually need to add "exercise" to the article. The words "oatmeal" and "calories" help search engines to understand the content of this article

It's a powerful keyword research tool that I've used and am very impressed with. 

Discover the best keywords and analyze the weaknesses of competitors