The term 'put into operation' can be described using three words: USE (3 letters), ACTUATE (7 letters), and TURNON (6 letters). 'USE' implies utilizing something for a specific purpose, while 'ACTUATE' means to put into motion or set in action. Finally, 'turnon' suggests activating something, such as a machine or device. Together, these three words describe the process of putting something into operation, which is the act of starting up a system or machine and making it ready for USE.