Heterocatenation is the term used to describe the bonding of different elements in a chain. It is a concept commonly used in chemistry to describe polymers or molecules made up of different elements. However, if you are looking for synonyms for the word "heterocatenation", there are several options available. Some of the possible synonyms for the term include cross-linking, covalent bonding, intermolecular interactions, and polymerization. Each of these terms refers to the joining of different elements together in a chain, albeit in slightly different ways. By using these synonyms, you can add variety to your writing and better communicate your ideas to others.