Category Nuances for null:

• reactive,
• organic,
• unwanted,
• antimicrobial,
• damaging,
• polar,
• acidic,
• volatile,
• primary,
• osmotic,
• intermediate,
• cytoplasmic,
• weak,
• acid,
• irritating,
• basic,
• biochemical,
• beneficial,
• natural,
• simple,
• essential,
• nonvolatile,
• relevant,
• conventional,
• physicochemical,
• aromatic,
• related,
• aggressive,
• chemical,
• small,
• unstable,
• dissolved,
• inorganic,
• undesirable,
• industrial,
• harmful,
• inflammable,
• single,
• residual,
• alternative,
• active,
• toxic,
• corrosive,
• extraneous,
• important,
• molecular,
• fragile,
• typical,
• hydrophilic,
• valuable,
• metabolic,
• fluid,
• colloidal,
• secondary,
• compatible,
• healthy,
• additional,
• homogeneous,
• functional,
• noxious,
• pure,
• nutrient,
• cellular,
• oxidized,
• aqueous,
• ionic,
• auxiliary,
• resistant,
• external,
• starting,
• diverse,
• minor,
• biological,
• ionized,
• complex,
• raw,
• medicinal,
• interfering,
• tasty,
• useful,
• odorous,
• effective,
• defined,
• antibacterial,
• smaller,
• stimulating,
• soluble,
• major,
• suitable,
• common,
• miscellaneous,
• metal,
• inhibitory,
• gaseous,

Simple Categories for null:

• substance,
• chemical,
• ligand,
• compound,
• acid,
• substrate,
• component,
• solute,
• catalyst,
• entity,
• change,
• agent,
• material,
• monomer,
• metabolite,
• nutrient,
• stabilizer,
• matter,
• buffer,
• intermediate,
• group,
• activator,
• constituent,
• salt,
• connection,
• antimicrobial,
• contaminant,
• volatile,
• fluid,