Synonyms for the word "cleavage" include: division, fissure, separation, split, break, rupture, breach, cut, notch, crevice, opening, gap, interval, hiatus, gulf, chasm, cranny, slit, and perforation. These words all refer to a separation or divide between two things or parts of something. Cleavage specifically refers to a division between two parts of the body, typically the breasts, but these other synonyms can be used more broadly to describe any type of divide or separation. The choice of synonym often depends on the context in which it is used, such as in a scientific or medical context versus a more casual conversation.