I'm going to spend little time here. It would take all day. Go to Ubersuggest.org and put "games" into the search box. Click on "original" to start. You could also click on any letter of the alphabet or a number. When you click on the Original option you will get many hundreds of items. You can click on any item and get a bunch more. You will have so many words and phrases it boggle your mind. Just dig down into an area until you have some words that might be useful keywords. Save them.

Say you saved some names: Now you have to evaluate them.

Next: Keyword Research