The word backtrail can be replaced with a variety of synonyms, depending on the context in which it is being used. For instance, one might opt to use backtrack, which carries a similar meaning of retracing one's steps to return to a previously visited location. Alternatively, the term retread could be employed, with a connotation of repetitively revisiting a particular trail or path. Other possible options include hindsight, which suggests looking back on past events or actions, or rearward, which emphasizes movement in a backward direction. Ultimately, the precise synonym chosen will depend on the specific tone and meaning desired for the given context.