The term "long-haired rat" refers to a specific type of rodent, known for its long fur. However, there are several synonyms for this term that can be used interchangeably. One common synonym is "plague rat," as these rodents were often associated with the spread of the bubonic plague during the Middle Ages. Another term used to describe these rats is "Norway rat," as they are native to Norway and other parts of Europe. Other synonyms for long-haired rats include "sewer rat," "brown rat," and "wharf rat." While these rodents may not be the most beloved creatures, their long-haired coats and distinctive features make them an interesting subject for study.