Modifiers matching cation:

• simple,
• soft,
• polyvalent,
• foreign,
• small,
• relevant,
• nonvolatile,
• endogenous,
• monovalent,
• hydrophilic,
• charged,
• complex,
• metal,
• counter,
• active,
• common,
• ordinary,
• mobile,
• free,
• divalent,
• undesirable,
• therapeutic,

Simple categories matching monovalent:

• ion,
• atom,
• cation,
• metal,
• acid,
• element,
• anion,
• group,