A charnel house is a term used to refer to a building or a room where dead bodies are stored. If you are looking for synonyms or alternative words for charnel house, you could use abattoir, mortuary, morgue, crypt, or ossuary. These words are used to describe a place where corpses are kept or prepared for burial. However, it is important to note that some of these words can connote different nuances, such as an abattoir being a place for slaughtering animals, while a mortuary is a facility for performing autopsies on dead bodies. Choose your word carefully based on context and intended meaning.