There are several synonyms that can be used in place of the phrase "score out." One alternative is "cross out," which means to mark something as incorrect or unnecessary by making an "X" over it. "Erase" is another synonym, referring to the act of removing or deleting something entirely. "Delete" is a more specific term, often used in reference to removing information from a computer or digital document. "Scratch off" can also be used, particularly in reference to physically removing a mark from a surface. Finally, "cancel" can be an appropriate synonym when referring to the nullification of something previously recorded or decided upon.