The phrase "doeth a t" can be replaced with several synonyms depending on the context. For instance, it can be substituted with "performs an action," "executes an act," or "carries out a task." Alternatively, it can be replaced with more colloquial language such as "gets things done," "accomplishes something," or "fulfills a duty." The use of synonyms can help make language more varied and interesting to readers. It can also lend a more formal or informal tone to the writing depending on the choices made. The trick is to select synonyms that accurately convey the intended meaning and suit the overall tone of the piece.