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Some of the words listed are palindromes. If you encode each word as 0 if it isn't a palindrome and 1 if it is a palindrome, you'll get 5 binary numbers. Translating these from binary to letters (A = 1, B = 2 etc) you get the word "morse". If you then look at the morse of each word instead, and encode it the same way as before, 0 if not a palindrome, 1 if it is (ignoring spaces, as title hints), you'll get another word, rails, which is the answer.