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gistfile1.txt

function wordsWithRepeatedChars(str) {

	var list = [];

    //split string into words based on spaces and count repeated characters
    str.toLowerCase().split(" ").forEach(function(currentWord){
		
		var lastLetter = "";
		var alreadyAdded = false;
        //split word into characters and add to the list only if a letter repeats
        currentWord.split('').forEach(function(letter){
			if (letter == lastLetter && !alreadyAdded) {
				list.push(currentWord);
				alreadyAdded = true;
			}
			
			lastLetter = letter;
        });

    });

    return list;
}

console.log(wordsWithRepeatedChars("aaa bbb abcbc"));