The phrase "war of the elements" describes a conflict between the natural forces of the world. Synonyms for this phrase might include "battle of the elements," "struggle of the elements," or "clash of the elements." Other options could include "fight of the elements," "warfare of the elements," or "confrontation of the elements." Each of these alternatives captures the same fundamental idea of a contest between the various elements of nature, whether that be in the form of raging storms, intense fires, or powerful earthquakes. Depending on the context, different phrasings might be more appropriate, but all of these choices would be viable options.