The term containing nitrogen is 'nitric', which is a 6-letter word. Nitric acid is a strong mineral acid composed of nitrogen and hydrogen, and it is used in many industrial processes. It is also used as a fertilizer, as it helps to increase the nitrogen content of soil. Nitric oxide is another compound containing nitrogen, and it is an important signaling molecule in the body. Nitric oxide plays a role in regulating blood pressure, inflammation, and other physiological processes.