Monostich is a term that refers to a poem consisting of a single line. However, there are several synonyms for this term that can be used interchangeably, depending on the context in which the word is used. One such synonym is "monoline", which is often used to describe a type of calligraphy where the writing is composed of a single line or stroke. Another synonym for monostich is "uniline", which is a term used to describe a writing style where the characters are all written in a single uninterrupted line. Finally, "mono-verse" is another synonym for monostich that suggests a single unit of poetic expression, much like a verse in a traditional poem format.