There are several synonyms for the word "motorizing," which means to power something with a motor or engine. One common synonym is "mechanizing," which refers to the process of automating a task or production with machines. Another synonym is "energizing," which can be used to describe the process of adding power or vitality to something. "Mobilizing" is also a synonym for motorizing, which suggests the process of preparing or setting something in motion for use or action. Other synonyms for this word include "engaging," "propelling," and "activating," all of which describe the process of powering something with a motor.