Intercellularly refers to something happening between cells, and there are several synonyms that can be used to describe this action. One of the most common synonyms for intercellularly is intracellularly, which describes something happening inside a cell. Another option is interstitially, which refers to something occurring in the spaces between cells. Additionally, words like paracellularly and transcellularly could be used to indicate movement through or around cells. Other possible synonyms for intercellularly include pericellularly, juxtacrine, and apocrine. Each of these words carries slightly different connotations and nuances, but they can all be used to describe processes that take place between or around cells in the body.