The word "nidder" is a rare term that is spelt as /ˈnɪdər/. It is used to describe a person who is cowardly or lacks courage. The word can be found in English literature, however, it is not a commonly used term in modern language. The spelling of "nidder" is derived from Old English, where it originally meant to cower or shrink away. Despite its obscurity, the word "nidder" can still be a useful addition to one's vocabulary.