The spelling of the word "knobel" can be tricky for non-native English speakers. It is pronounced /ˈnəʊbəl/ and has a silent "k" at the beginning. The "o" is pronounced as a short vowel sound, similar to the "o" in "not". The "b" and "l" are pronounced normally. This word is not commonly used in modern English, and it means "nut or knob" in old English. Understanding the phonetic transcription can help one to pronounce this word correctly.
The word knobel does not have a widely known etymology. It seems to be a relatively uncommon term with various meanings depending on the context. In German, knobel can refer to a dice game or to solving puzzles or riddles. It is possible that the word knobel originated from the Middle High German word knobel meaning to chip or whittle or from the German word Knopf meaning button. However, without further clarification on the specific context or language you are referring to, it is challenging to provide a more precise etymology of the word knobel.