Man who is big in head use many hard words but man who is bigger in head use only ten hundred words.
I worry less about the man who has said ten hundred words than the man who has said one word ten hundred times.
95% of big science words are there because if you used the perfectly reasonable common word it could get confusing quickly, since there might be 10 slightly different things in your field that could all be described as such and you need to distinguish them. And God help you if you try to communicate between even closely related disciplines, who even use different mathematical notation conventions.
Imagine feeling smart
Couldn’t be me