The phrase "force into a smaller space" can be synonymous with several other words. One such word is "compress," which means to press or squeeze something into a smaller space. Another synonym is "constrict," which refers to restricting or narrowing the space available for movement or expansion. "Cramp" is another term that can be used to describe forcing something into a confined space. "Squeeze" is yet another word that can be used to convey the idea of compressing or forcing into a smaller space. Finally, "cram" can also be used to describe forcibly fitting something into a small space.