The term 'white as a ghost' is often used to describe something that is very PALE or colorless. This phrase can be represented in a crossword puzzle by the solutions ASHEN (5 letters), ASHY (4 letters), WAN (3 letters), and PALE (4 letters). ASHEN refers to a grayish-white color, while ASHY implies a dull, grayish color. WAN means having a PALE, sickly complexion, and PALE is a light color that lacks intensity. All of these words are used to describe something that is very light or colorless, like a ghost.