There are several synonyms for the word "overcrossing," which typically refers to a structure that passes over another structure or obstacle. One common synonym is "overpass," which is often used to describe a bridge or elevated roadway that spans over a busy highway or railroad track. Another synonym is "flyover," which is typically used in British English to describe an elevated roadway or bridge that passes over another roadway or intersection. Other synonyms include "overbridge," "over-bridge," "over-bridge," and "overhead crossing," all of which are typically used to describe elevated structures that cross over other structures or obstacles.