The word "likker" is a colloquial term for alcohol, specifically moonshine. However, there are several synonyms for the word that one can use in more formal settings. These include spirits, liquor, booze, hooch, and even firewater. Each of these words has a slightly different connotation and origin. For example, "spirits" refers to any distilled beverage, while "hooch" is more commonly associated with homemade or low-quality alcohol. "Booze" is a slang term that is often used in a casual or derogatory manner. Ultimately, the choice of synonym will depend on the context and tone of the conversation or writing.