A conceptacle is a specialized structure found in algae and some marine animals that contains reproductive cells. Other words that can be used to describe these structures include utricle, receptacle, and gonangium. Utricles are fluid-filled sacs that house reproductive cells in some algae, while receptacles are hollow structures found in some brown and red algae. Gonangia can be found in marine animals such as hydroids and contain reproductive cells. It is important to use synonyms when discussing scientific concepts to avoid repetition in writing and to ensure clarity for the reader.