Modifiers matching efficiency:

• operational,
• environmental,

Simple categories matching environmental:

• condition,
• aggression,
• surface,
• layer,
• piece,
• resource,
• technology,
• contaminant,
• audio,
• level,
• hazard,
• selection,
• assay,
• event,
• attack,
• occurrence,
• installation,
• property,
• efficiency,
• object,
• idea,
• situation,
• injury,
• impact,
• model,
• project,
• barrier,
• issue,
• business,
• chemistry,
• change,
• gradient,
• commodity,
• activity,
• factor,
• cost,
• tolerance,
• user,
• antigen,
• modification,
• equipment,
• division,
• health,
• streptococcus,
• politics,
• tissue,
• pollution,
• water,
• interaction,
• microbe,
• area,
• duty,
• constituent,
• machinery,
• conservation,
• experience,
• location,
• matrix,
• conflict,
• rehabilitation,
• coating,
• employment,
• debris,
• organization,
• management,
• preservation,
• damage,
• bacteria,
• company,
• biotechnology,
• goal,
• movement,
• interference,
• matter,
• advisor,
• tension,
• circumstances,
• aspect,
• use,
• shift,
• enhancement,
• mixture,
• catastrophe,
• profession,
• consequence,
• study,
• odor,
• body,
• facility,
• characteristic,
• dynamics,
• light,
• constraint,
• point,
• impurity,
• work,
• specialist,
• ligand,
• mineral,
• contact,
• solid,
• science,
• pickup,
• sustainability,
• design,
• treasure,
• touch,
• detector,
• power,
• waste,
• zone,
• plan,
• obstacle,
• attribute,
• benefit,
• cleaning,
• scientist,
• behavior,
• tool,
• thing,
• hepatotoxin,
• security,
• theme,
• odour,
• infrastructure,
• analysis,
• education,
• fuel,
• carcinogen,
• obstruction,
• source,
• receptor,
• instrument,
• belief,
• unit,
• tax,
• force,
• utility,
• device,
• elements,
• toxin,
• contamination,
• concentration,
• stimulus,
• fee,
• cd,
• requirement,
• text,
• substrate,
• print,
• scan,
• stressor,
• adaptation,
• clue,
• degradation,
• educator,
• problem,
• catalyst,
• game,
• statute,
• input,
• noise,
• job,
• microorganism,
• development,
• asset,
• gas,
• organisation,
• support,
• sensation,
• effect,
• dimension,
• flow,
• danger,
• difference,
• heritage,
• failure,
• control,
• measure,
• niche,
• law,
• region,
• economist,
• agreement,
• values,
• pollutant,
• poison,
• reservoir,
• professional,
• variation,
• chemical,
• variable,
• group,
• discomfort,
• discipline,
• program,
• limitation,
• task,
• therapy,
• data,
• thought,
• state,
• disease,
• action,
• communication,
• expert,
• performance,
• insult,
• fomite,
• fluid,
• whole,
• fact,
• organism,
• stimulation,
• directive,
• designer,
• medium,
• protection,
• disaster,
• standard,
• expense,
• institution,
• agent,
• fixture,
• topic,
• consultant,
• trauma,
• fabric,
• effort,
• initiative,
• entity,
• deed,
• stewardship,
• repair,
• fluctuation,
• signal,
• weather,
• calamity,
• alteration,
• threat,
• specialty,
• tragedy,
• stuff,
• structure,
• item,
• material,
• quality,
• industry,
• practice,
• component,
• grouping,
• document,
• investigation,
• trouble,
• system,
• hydraulics,
• ngo,
• predator,
• pressure,
• challenge,
• phenomenon,
• influence,
• information,
• recovery,
• disorder,
• parameter,
• difficulty,
• stone,
• allergen,
• knowledge,
• liquid,
• service,
• field,
• agency,
• sound,
• pathogen,
• cue,
• status,
• compound,
• form,
• painting,
• malady,
• stress,
• process,
• scene,
• disturbance,
• report,
• measurement,
• works,
• illness,
• substance,
• resistance,
• policy,
• time,
• harm,
• subject,
• test,
• exposure,
• incident,
• pest,
• meeting,
• sensor,
• muffler,
• arrangement,
• trait,
• cause,
• scheme,
• care,
• assets,
• perturbation,
• toxicology,
• space,
• indicator,
• engineering,
• torque,
• improvement,
• marker,
• commitment,
• feature,
• review,
• output,
• metal,
• toxicant,
• product,
• sampling,
• sensitivity,
• message,
• testing,
• footprint,
• regulation,
• catalysis,
• consideration,
• sample,
• technique,
• simulation,