Sorry, Ahava: nothing much comes to mind. Many don't change significantly; for instance, I don't see any real change between 'force' and 'forces'. But I will bump this thread back up for you: .
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AnonymousBrain. Brains Thomas Jefferson was top notch in the brains department. - So You Want To Be President ( a children's book)While the singular refers to the human organ, the plural refers more to 'intelligence'.