Category Nuances matching oxygen:

• elemental,
• free,
• active,
• dissolved,
• molecular,
• bound,
• pure,
• atomic,
• abundant,

Members for simple category oxygen:

• pt,
• air,
• hydrogen,
• singlet_oxygen,
• rf,
• pd,
• fe,
• mn,
• ambient_air,
• cobalt,
• oxygen_gas,
• cu,
• ozone,
• ferrous_iron,
• no,
• nitrate_no,
• iron,
• manganese,
• nitrogen,
• pure_oxygen,
• phosphorus,
• single_oxygen,
• welder_oxygen,