Modifiers matching surfactant:

• natural,
• charged,
• organic,
• auxiliary,
• biological,
• soluble,
• toxic,
• diverse,
• hydrophilic,
• cationic,
• ionic,
• inexpensive,
• special,

Simple categories matching cationic:

• current,
• metal,
• lipid,
• salt,
• drug,
• reactant,
• material,
• antibiotic,
• contaminant,
• substance,
• component,
• anesthetic,
• anaesthetic,
• marker,
• polymer,
• antiseptic,
• ion,
• medication,
• system,
• surfactant,
• compound,
• carrier,
• ligand,
• chemical,
• agent,
• mineral,
• group,
• catalyst,