Solution - Puzzle No. 012 (#004)

This is a word search, where the words can take right and left turns instead of just going straight. The words we are looking for come in groups of twelve, as suggested by the title: the signs of the zodiac (green in the solution), the gifts in the twelve days of christmas (blue in the solution), and the months of the year (red in the solution). The nine unused letters spell the answer from top to bottom: INCREMENT.