Whether they’re right or wrong, people make assumptions about your intelligence, education and capabilities every time you speak. Studies have proven that your vocabulary is directly linked to career advancement and income. The first impression is the most important, and these words will make it count. The vocabulary you’ll learn isn’t full of technical jargon - these are words that successful businesspeople use every day. You’ll master words like Paradigm. Ambiguity. Stipulate. Extrapolate.