The term "alternative routing" can be replaced with several other words or phrases. One option is "detour," which implies a different route taken to reach the same destination. Another synonym is "diversion," which suggests a temporary change in the intended route. "Rerouting" is also a suitable alternative, as it conveys a new path being taken due to unforeseen circumstances. "Alternative path" or "alternate route" are less specific terms, but still convey the idea of a different way to get from point A to point B. "Roundabout" implies a longer, more indirect route but can also connote a more leisurely or scenic journey.