Bunyip
pro scapegoat
Actually, no - not at all.Usually definitions are paramount to understanding what people believe and why.
If you wanted to understand what a person believes - you would simply ask them. Arguing about word meanings is the alternative to understanding what people believe.
You can argue about the definition of 'atheism' for years, and get nowhere - because of course there IS NO SINGLE UNIVERSALLY ACCEPTED DEFINITION. But if you ask a person what they believe and worry less about labels then a productive exchange is possible.
Words are defined by their usage, there is no arbiter of definitions. There is no single correct definition, language does not work that way.