I suggest a word, the next poster responds with a clue (as in crossword) for that word, then adds the next word.
e.g. soprano - mafiosi cornet player

so by going like this Mouthpiece the next person would say "Object of a metallic form used to translate lip vibrations into the production of sound in a musical instrument." and leave a clue like" Discussion". the next person would leave a message to the clue what Discussion, and wait for the next person to comment on it.

I will start with this word for someone to leave a message what it is.