The larger the scope, the harder it is to fully understand.
In a tight loop with a scope of one line, a variable’s name can be one letter. This is often an array index or some kind of counter.
As the scope gets larger, the variable name should become a word representing a business object.
When the scope of a variable exceed that of a single method, there definitely becomes a stronger chance of confusion, so the name may need to involve multiple words.
In all cases the variable’s name should be immediately obvious to the reader. And when they see a really long name, that should be a red flag to the reader that this variable may have an extended scope.
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