"To-" is a prefix commonly used in English language. It is often added to verbs, indicating movement or direction towards a particular thing or place. However, there are several synonyms for the word "to-" which can be used interchangeably depending on the context. Some of these synonyms include "toward," "at," "into," "unto," "upon," "forward," "along," "through," and "across." Each of these words represents a slightly different meaning and can be used to convey a particular message or idea. Therefore, it is important to choose the appropriate synonym for the word "to-" depending on the intended meaning and context of conversation or writing.