Modifiers matching surfactant:

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

Simple categories matching biological:

• variation,
• material,
• indicator,
• process,
• disturbance,
• molecule,
• activity,
• science,
• work,
• works,
• intervention,
• compartment,
• environment,
• fluid,
• memory,
• event,
• treatment,
• passage,
• component,
• relationship,
• aggregate,
• procedure,
• tissue,
• father,
• description,
• system,
• appendage,
• substrate,
• toxin,
• difference,
• macromolecule,
• fertilizer,
• substance,
• stress,
• artifact,
• operator,
• coating,
• world,
• illness,
• member,
• pattern,
• food,
• amine,
• field,
• space,
• container,
• interest,
• modification,
• carrier,
• issue,
• processing,
• sex,
• weapon,
• cell,
• complication,
• trauma,
• catalyst,
• industry,
• polymer,
• content,
• filter,
• surfactant,
• sector,
• evidence,
• diversity,
• protein,
• phase,
• hazard,
• nutrient,
• network,
• identification,
• data,
• signal,
• membrane,
• technology,
• drug,
• task,
• profession,
• option,
• sensor,
• shape,
• target,
• anion,
• swarm,
• liquid,
• enzyme,
• marker,
• parameter,
• assay,
• area,
• chamber,
• unit,
• contaminant,
• mineral,
• buffer,
• polysaccharide,
• ontology,
• society,
• ligand,
• specimen,
• relative,
• level,
• group,
• element,
• noise,
• improvement,
• measure,
• variable,
• sequence,
• development,
• preparation,
• disposition,
• surface,
• entity,
• mechanism,
• stimulant,
• structure,
• duct,
• detector,
• danger,
• constraint,
• team,
• reservoir,
• index,
• community,
• object,
• offspring,
• conduit,
• consequence,
• criterion,
• performance,
• movement,
• boundary,
• sample,
• factor,
• organism,
• attribute,
• assembly,
• secretion,
• matter,
• project,
• result,
• significance,
• brain,
• disease,
• infection,
• machinery,
• state,
• application,
• knowledge,
• invasion,
• times,
• passageway,
• evolution,
• terms,
• creature,
• maturation,
• benefit,
• effect,
• vocation,
• waste,
• fiber,
• pigment,
• measurement,
• item,
• residue,
• alcohol,
• subject,
• discipline,
• machine,
• plant,
• lipid,
• situation,
• reaction,
• characteristic,
• engineering,
• scientist,
• activator,
• rhythm,
• poison,
• phenotype,
• arts,
• consideration,
• source,
• agent,
• damage,
• integrity,
• condition,
• aspect,
• magnitude,
• disorder,
• adhesive,
• medium,
• precursor,
• resource,
• cycle,
• contamination,
• gel,
• constituent,
• chemical,
• impurity,
• fertiliser,
• individual,
• sound,
• cofactor,
• medication,
• character,
• filament,
• particle,
• response,
• origin,
• concept,
• interaction,
• asymmetry,
• trait,
• pathway,
• composition,
• thing,
• microbe,
• abnormality,
• age,
• anticoagulant,
• surroundings,
• effector,
• information,
• tendency,
• complex,
• problem,
• chemistry,
• function,
• antioxidant,
• pesticide,
• motive,
• force,
• species,
• drive,
• matrix,
• culture,
• organization,
• solution,
• end,
• glue,
• quantity,
• category,
• organs,
• part,
• layer,
• study,
• pest,
• fibre,
• analysis,
• program,
• sludge,
• microorganism,
• mixture,
• sugar,
• variant,
• action,
• behavior,
• motion,
• means,
• domain,
• flow,
• irregularity,
• therapy,
• kin,
• pathogen,
• product,
• notion,
• act,
• textile,
• necessity,
• assemblage,
• testing,
• organisation,
• nature,
• fibril,
• stimulus,
• insulator,
• relic,
• inquiry,
• grouping,
• particulate,
• phenomenon,
• success,
• test,
• limb,
• quality,
• solid,
• body,
• defect,
• change,
• vessel,
• control,
• topic,
• behaviour,
• research,
• fuel,
• frontier,
• parent,
• ingredient,
• feature,
• reason,
• concretion,
• property,
• form,
• compound,
• cause,