The answer to the crossword puzzle is 'ROOF, ' which is a four-letter word. This term can be interpreted as a place where Shakespeare's plays may be seen, such as in a theater or an outdoor amphitheater. The ROOF of a theater or amphitheater is often the best place to view a performance, as it provides a great vantage point for the audience. Additionally, many theaters and amphitheaters have been built with roofs specifically designed to enhance the acoustics of the performance. Therefore, the term 'WHERE SHAKES MAY BE SEEN' can be interpreted as referring to the ROOF of a theater or amphitheater.