What is another word for who-who?
Pronunciation: [hˌuːhˈuː] (IPA) 
Who-who is a phrase often used to describe the sound made by an owl. However, there are other synonyms that can be used to describe this sound including hoot, screech, shriek, and scream. Depending on the context, these synonyms can be used interchangeably to convey the same meaning. For instance, a writer may use the word "hoot" instead of "who-who" to describe the sound made by an owl in a story without changing the intended meaning. In essence, synonyms for "who-who" offer writers and speakers more variety in their choice of words and ultimately improve their ability to communicate efficiently.
