The word "next-beside" can be replaced by several synonyms, depending on the context. Some examples of synonyms include "adjacent," "adjoining," "neighboring," "proximate," or "contiguous." "Adjacent" refers to something next to or nearby, while "adjoining" refers to something that is connected to or touching something else. "Neighboring" refers to something that is nearby or in close proximity, while "proximate" pertains to objects or places that are physically close to each other. "Contiguous" refers to objects that are touching each other or in direct contact. These synonyms provide a wide range of options and can help bring more depth and variety to your writing.