Bystreet is a word that refers to a secondary or narrow street that runs parallel to a main street or avenue. There are several synonyms for the word bystreet, including backstreet, alley, lane, side road, and side street. Each synonym is slightly different in its connotation and use, but all refer to a smaller, less-trafficked road that is usually lined with smaller buildings or homes. Some of these words may have a more negative connotation, such as alley, which can suggest a dingier or shadier location. However, all words ultimately convey the idea of a smaller, parallel route that runs alongside a larger street or avenue.