What is another word for "gas"?

Roget's Thesaurus (1911) lists these synonyms for "gas": abeyance, absence, acrid, acridity, adust, aeration, aerial, aerification, aeriform, aerodynamics, aerography, aerology, aerometer, aerometry, aeronaut, aeronautics, aeroscope, aeroscopy, aerosphere, aerostatics, aerostation, agent, air, airy, alcohol, alembic, alkali, ammonia, ammoniacal, anaesthesia, anaesthetic, anaesthetize, and, andiron, aneroid, anhydrous, area, arefaction, arid, aridity.