The sound a flute makes is typically spelled as "whistle" or "flutey."
rowr!
The sound a penguin makes is typically spelled "hok hok" or "bray."
Varooooom
The sound a buzzer makes when the answer is wrong is typically spelled as "bzzz" or "buzz."
Werewolf doesn't have an 'h' in it. It is spelled werewolf.
The sound a goat makes is typically spelled "maa" or "bleat."
Ka-ching!
vroom
Unnh!
The typical written expression for a yawn sound is "ho hum."
Those letters will spell werewolf.