"Behind" is a preposition used to indicate the position at the back of an object, person, or location. However, depending on the context, there are numerous synonyms that you can use instead of "behind." For instance, "rearward," "backward," "after," and "trailing" are just a few of the alternatives. You can also use "following," "last," "at the rear," "to the rear," or "on the tail end." These synonyms are critical in creating variety and preventing repetitiveness in speech or writing. So, instead of constantly using "behind," you can employ these synonyms to convey the same meaning but in different words.