I am writing a post about the difference between what vs how, but then got stuck with how to explain this.
We say 'what is it called?', not 'how is it called?' when we are asking the way to call something.
But, we say 'how is it spelled?', not 'what is it spelled?' when we are asking the way to spell something.
Is there a good way to explain this? Is it because, in 'what is it called?', we are asking about the name of the object, and not necessarily the way to call it? I think if I write this, that will confuse my readers even more because they can also think that the name of the object is also the way we call it.