The term 'substitutes (for)' can be broken down into five different crossword solutions: ACTS (4 letters), ACTSAS (6 letters), SITSIN (6 letters), STANDSIN (8 letters), and TAKESTHEPLACEOF (15 letters). Each of these terms refers to the act of replacing someone or something with another person or thing. For example, 'acts' could refer to a person taking on the role of another person, while 'actsas' could refer to a person taking on the role of an object. Similarly, 'sitsin' could refer to a person taking the place of another person in a seat, while 'standsin' could refer to a person taking the place of another person in a standing position. Finally, 'takestheplaceof' could refer to a person or object completely replacing another person or object.