Mammillae are small, nipple-like projections on certain organs or tissues in the body, such as the breasts, tongue, or digestive tract. Synonyms for mammillae include papillae, nipples, teats, protrusions, projections, bumps, nodules, bulges, and knobs. Papillae is often used to describe the small projections on the tongue or skin, while nipples and teats are commonly used to refer to the mammary gland in mammals. Protrusions, projections, bumps, nodules, bulges, and knobs generally refer to any small, raised structure on an organ or tissue. These synonyms can be used interchangeably depending on the context, but all typically refer to the same type of anatomical structure.