Modifiers matching buffer:

• nonvolatile,
• cellular,
• volatile,
• minor,
• intracellular,
• organic,
• inorganic,
• alkaline,
• common,
• aromatic,
• enzymatic,
• complex,
• charged,
• dilute,
• active,
• acid,
• biological,
• ancillary,
• standard,
• nontoxic,
• simple,
• working,
• basic,
• gaseous,
• stable,
• acidic,
• mobile,
• salt,
• chemical,
• exogenous,
• natural,
• urinary,
• inexpensive,
• appropriate,
• physiological,
• endogenous,

Simple categories matching nontoxic:

• leaf,
• material,
• solution,
• liquid,
• metal,
• salt,
• solvent,
• solute,
• substance,
• bark,
• solid,
• component,
• gas,
• chemical,
• acid,
• compound,
• oil,
• coating,
• plant,
• buffer,
• fluid,
• agent,
• fabric,
• ingredient,
• constituent,
• antifreeze,
• product,