The term 'break of day' is used to refer to the time of day when the sun rises and the sky begins to lighten. This term can be represented by a variety of words, including NAP (3 letters), SIESTA (6 letters), DAWN (4 letters), MORN (4 letters), AURORA (6 letters), NOON (4 letters), SUNUP (5 letters), and FIRSTLIGHT (10 letters). Each of these words describes the time of day when the sun rises and the sky begins to lighten, making it the break of day.