Category Nuances for null:

• salivary,
• corrosive,
• functional,
• dissolved,
• damaging,
• theoretical,
• inorganic,
• polar,
• minor,
• intracellular,
• ionic,
• atomic,
• labile,
• mobile,
• reactive,
• suitable,
• smaller,
• liquified,
• impervious,
• interfering,
• acidic,
• volatile,
• pure,
• salt,
• residual,
• heavier,
• large,
• unwanted,
• acid,
• major,
• chemical,
• harmful,
• heavy,
• single,
• concentrated,

Simple Categories for null:

• element,
• group,
• substrate,
• gas,
• number,
• liquid,
• system,
• substance,
• component,
• constituent,
• halogen,
• material,
• atom,
• affinity,