The words but and put are spelled differently because they are two different words with different meanings.
they are spelt differently
It is spelt differently
they are both spelt differently :)
They are spelt differently.
no, they are spelt differently
They are spelt differently :L
They are spelt differently
They are spelt differently.
they're spelt differently.
It is a very rare name, and is spelt and said differently. Not many people have that name that is spelt like that.
The same, only spelt differently: "centimetre"
They're spelt and pronounced differently