Ghoulie is an informal term which refers to an imaginary ghost or monster. This term has been used for decades in popular culture, especially in horror films. However, there are other words that can be used as synonyms for "ghoulie". These words include goblin, specter, phantom, poltergeist, and apparition. These words also depict the same image of an eerie creature that is associated with horror and supernatural activities. Nonetheless, the use of these words depends on the context and the tone of the conversation. In general, they are all great alternatives to "ghoulie" that can effectively convey the intended message.