The word "mid-den" can have various synonyms depending on the context and usage. If we are referring to a place where animals live, the word "burrow" or "den" can be used instead. If we refer to a hidden or secret location, then "hideout", "lair", or "retreat" can be good alternatives. In the context of a home or dwelling place, "abode", "lodging", "domicile", or "quarters" can be used instead. For a small room, "cubbyhole", "closet", or "nook" can all work. Finally, in the sense of a difficult situation or challenge, "predicament", "quandary", or "conundrum" can be synonyms for "mid-den".