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The letters "gh" in the word "ought" are silent but "ought" is not pronounced like "out"
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
Also, the first printing presses that came to England were accompanied by Dutch type setters. They sometimes made spellings more Dutch (changing gost to ghost for example). They were also paid by the line, so would occasionally add unnecessary letters to words.