Step-by-step explanation:
When I speaker you some specialised vocabulary related to a topic in help to make the speech or the topic more effective and clear. And when something is to effective and their is an effectiveness then a person things like the speaker has lot of idea about the topic he or she is speaking. But if we didn't use a proper or specialised word then it can be hard for listener to understand things what we are speaking. When speaker use specialised vocabulary it's so like it's a unique topic and also it helps or make other concerntraten on the main point of the topic.