The word "bullthrower" is quite uncommon and there are not many synonyms that can be used for it. However, some alternatives such as "spear thrower," "atlatl," "woomera," and "aelae" could be used. These words refer to a tool used in prehistoric times to increase the range and power of a thrown spear. Besides that, there are other common synonyms for "bull" such as "steer," "ox," "bovine," "cattle," and "cow." Therefore, if you require to write an article using the term "bullthrower," there are a few synonyms available that can be used to replace it in your writing.