Simple categories matching observed:

• outcome,
• quantity,
• behavior,
• event,
• association,
• particle,
• variation,
• fact,
• commodity,
• evidence,
• process,
• property,
• structure,
• action,

Members with property observed:

• color,
• covariance,
• change,
• temporal,
• fault,
• mass,
• chemical_shift,
• diplomatic_move,
• silence,
• mutual_respect,
• program,
• formal_equivalence,
• multiplicity,
• observation,
• distribution,
• spectral_type,
• person_attitude,
• acquisition,
• luminosity_function,
• reflectivity,
• spectroscopic_characteristic,
• surface_brightness,
• tv_programme,
• surface_rain,
• term_structure,
• restlessness,
• war,
• broadband_colors,
• approach,
• apparent_magnitude,
• layoff,
• indication,
• tone,
• magnitude,
• abortion,
• position,
• light,
• tone_presentation,
• salinity,
• jet,
• reproduction,
• liver_retention,
• drinking,
• momentum,
• means,
• employment,
• job_assignment,
• hand_shape,
• light_curve,
• strength,
• sealing,
• decay_times,
• variability,
• birth,
• gender-role_division,
• colour_ratio,
• possible_communication,
• piece,
• period_distribution,
• loop_length,
• polymerisation,
• angle,
• planned_attack,
• information_search,
• electric_charge,
• coordination,
• weight,
• colour_index,
• natural_selection,
• gamma-ray_efficiency,
• length,
• radial_wind,
• industry,
• hand,
• surface_temperature,
• shut_times,
• band_contour,
• downsizing,
• variance,
• apparent_luminosity,
• biological_activity,
• barometric_pressure,
• soil_property,
• x-ray_color,
• predation,
• facial,
• gdp,
• transverse_energy,
• gravity_disturbance,
• revenue,
• backlog,
• direction,
• thickness,
• countermove,
• frequency_spectrum,
• verbal_contact,
• duration,
• fire,
• flood,
• concentration,
• vertical_motion,
• wind_speed,
• molecular_weight,
• hesitancy,
• ag,
• gravity_anomaly,
• intention,
• mutation,
• emission,
• emergency_fallout,
• meridional_heat,
• biomass_production,
• background,
• size,
• level,
• hit,
• growth_cone,
• height,
• excitation_probability,
• open_period,
• behavior,
• target_detection,
• luminosity,
• shot,
• growth,
• number_density,
• slope,
• electron_density,
• movement,
• stock_price,
• radiological_investigation,
• charge,
• amplitude,
• angular_diameter,
• stress_relaxation,
• soybean_set,
• sea,
• background_intensity,
• temperature,
• book_leverage,
• density,
• radius,
• energy_dissipation,
• touchdown,
• political_issue,
• source_flux,
• development,
• chromosomal_breakage,
• steady_pickup,
• maximum_temperature,
• pressure,
• death,
• increasing_stiffness,
• storm,
• birth_order,
• repetitive_behavior,
• burst_length,
• precipitation,
• hospitalization,
• infanticide,
• wind_direction,
• apathy,
• dehydration,
• encephalitis,
• time,
• flux,
• peak,
• extraversion,
• cohesive_energy,
• energy,
• climatic_event,