The spelling of the word "Rainhold" can be broken down using IPA phonetic transcription. The /r/ sound is represented by the letter "r," while the /eɪ/ diphthong is spelled with "ai." The /n/ sound is shown by "n," and the /h/ sound is represented by "h." Finally, the word ends with the /əʊ/ diphthong, which is spelled as "o" in combination with the silent letter "l." Therefore, the correct spelling of this word is "Rainhold," with the pronunciation /ˈreɪn.həʊld/.