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The key differences between SEMRush and Google Keyword Planner are the amount of data that you can access. While Google Keyword Planner is free and lets you access keyword ideas and the search volume, SEMRush is a premium tool that has a lot more data and features.
Nonetheless, both can be great tools and not everyone needs a premium tool such as SEMRush.
What Is Google Keyword Planner?
Google is a free tool provided within Google Ads that lets you note down or list keywords.
It also shows you keyword ideas and gives you a rough idea of how many people are searching for them.
Although it was originally made for PPC Campaigns, the data such as the search volume can, of course, be useful for SEO.
Google Keyword Planner: Features
As Google Keyword Planner is a little free tool provided by Google, it has limited features.
Find Keyword Ideas
Using the Google Keyword Planner, you can find new keyword ideas for your SEO & PPC Campaigns.
You can then also list these keywords so that you have a nice list of keyword ideas.
You can also get some keyword data, although it is very limited.
The competition is just described as low medium and high, while the search volume is usually shown as 100-1000 and figures like that.