The word "trailings" can be substituted with various synonyms, including residues, remnants, remains, leftovers, and leavings. "Residues" refer to the leftover fragments or substances after a process is completed, while "remnants" refers to the remaining parts of something that has been partially destroyed or removed. On the other hand, "leftovers" and "leavings" are used to refer to the remaining food after a meal or the scraps after a particular activity. All these synonymous words share a common meaning, which is the remaining or leftover parts after something has been consumed or used.