Macroporous is a term used to describe materials that have large pores or voids within it. Synonyms for this term include spongy, porous, cavernous, pitted, and honeycombed. These words illustrate that the material has a structure with large holes that allow for the easy flow of fluids and gases through it. Other related words are reticular, which suggests a network of voids, and permeable, which denotes that the material allows substances to pass through it. These synonyms describe the physical properties of macroporous materials and are useful in understanding their applications, such as in filtration or catalysis.