There are several synonyms for the word "immobilizes." One common one is "paralyzes," which refers to a complete inability to move or function. Another synonym is "restricts," which implies some degree of limitation or constraint. "Hobbles" is another option, suggesting a slowed or limited movement. "Stymies" can also be used to imply an obstacle or blockage preventing movement or progress. Additionally, "incapacitates" connotes a reduction in one's ability to function, often due to injury or illness. Overall, there are a variety of options for expressing the concept of immobilization in different contexts.