Shifting away from riddles for this one, purely wordplay and anagrams instead, the kind of thing that is oddly satisfying once it clicks into place.
1. Rearrange the letters of "LISTEN" to get another common word.
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2. What common English word has three consecutive double letters?
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3. I am an odd number. Take away a letter and I become even. What number am I?
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4. What common English word contains all five vowels in order, exactly once each?
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5. Rearrange "ASTRONOMER" to get another word connected to space.
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6. What word starts and ends with the same three letters, in the same order?
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7. Add two letters to "HEAR" to make a new word meaning the floor of a fireplace.
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8. What word in the English language does the following: the first two letters signify a male, the first three letters signify a female, the first four letters signify a great person, while the entire word signifies a great woman.
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Try these before scrolling down, some of them take a minute to click but feel genuinely satisfying once they do.