Health app
I accidentally deleted my health app. When I looked in the App Store for the Health app, it wasn't listed.
iPhone 12 Pro, iOS 14
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I don't believe you can delete the Health app. You most likely 'removed' it, which sends it to the App Library
From your Home Screen, swipe left until you get to the App Library.
Swipe downward and you'll get an alphabetical list of your apps.
Locate the app in the list or type the app name into the search field
Once you've located the app, tap/hold until it raises/selects, then drag it and it'll pop out to your Home Screen
Organize the Home Screen and App Library on your iPhone - Apple Support