The one rule worth repeating here
Never repeat a word already used in the app name or subtitle inside this field — Apple combines matches across fields, so the repeat buys nothing and the character it costs is one you don't get back. Google Play has no equivalent hidden field; its indexed surface is the visible name, short and long description.
See this for your own app
Paste your store link, add your keywords. Rank, the apps above you and demand are measured every day.
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