The phrase "that other" can be replaced by several synonyms in the English language. Some of these synonyms include "the opposite," "different," "alternate," "another," and "contrary." These words can be used to help describe a specific object or person in comparison to another. For example, instead of saying "that other book," one could say "the alternate book." Similarly, instead of saying "that other person," one could say "the contrary person." Using synonyms can be a great tool to add variety and interest to your writing or speech.