The crossword solutions for the term ARGON OR NEON are GAS and ELEMENT. Argon and Neon are both gases that are found in the atmosphere and are also chemical elements. They are both colorless, odorless, and non-toxic. Argon is the third most abundant GAS in the Earth's atmosphere, while Neon is the second most abundant noble GAS. Both elements are used in a variety of applications, including lighting, welding, and medical treatments.