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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.
They're not silent letters, they're modifiers. They modify the sound of surrounding letters. An example of a silent letter would be the P in psychology (in the English language only).