The word "lehar" is a Hindi term that is commonly used to refer to waves. However, there are several synonyms that can be used to describe lehar in different contexts. For instance, in an ocean or sea, lehar can be referred to as swells, surges, or rollers. In contrast, if we are talking about soundwaves, lehar can be called sound waves or sound vibrations. In the context of physics, lehar can be referred to as a wave or an oscillation. Other synonyms for lehar include tide, tsunami, billow, and breaker. Whatever the context might be, there is always an apt synonym for lehar to describe its various characteristics and implications.