Remove an automatic correction from the dictionary?
Yes, there is a workaround for this.

Navigate to Settings -> General -> Keyboard -> Text Replacement

You can now add "munutes" as the phrase and shortcut.

This will ensure your spell check won't autocorrect "munutes" from now on.

I have had to do this for my actual name as well as some of my friends names as autocorrect isn't a fan of Irish names.