Hee-hawing refers to the loud, braying noise made by a donkey or a mule. However, when it comes to finding synonyms for this word, one can explore different terms that describe similar sounds. Some of the available options include neighing, braying, yelping, yowling, barking, hollering, howling, and screaming. Depending on the context, you can choose the most suitable synonym to convey the intended meaning. For example, "yelping" could be used to describe a high-pitched, startled sound, while "braying" implies a long, drawn-out noise. By using synonyms, you can add variety and richness to your writing while avoiding repetition.