Devilkin is a word that refers to a diminutive form of the devil or a mischievous and impish person. It is a relatively uncommon word in English, but there are a few synonyms that can be used to describe the same concept. One such word is imp, which carries the same connotations of playfulness and mischief. Another synonym for devilkin is fiend, which refers to a wicked or evil entity. Additionally, the word demon can also be used as a synonym, as it describes a malevolent supernatural being. Ultimately, the choice of synonym will depend on the context and tone of the writing.