Odd Man Out

Alrighty - time to waste time at work exercise those brain cells. Ready for the brain bender via the handy dandy discount MENSA calendar? Here we go!

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Which of the words below is least like the others? (The difference has nothing to do with vowels, consonants or syllables.)

• PAINS
• RAIN
• ENEMY
• CLERGY

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Well there you have it. And like always, the answer will be found later in the comments. See you then!