Simple categories matching acoustic:

• practice,
• instrument,
• wonder,
• reflector,
• instrumentation,
• resonator,
• sound,
• interference,
• keyboard,
• signal,
• alarm,
• noise,
• structure,
• attribute,
• property,
• filter,
• system,
• medium,
• characteristic,
• activity,
• detector,
• output,
• group,
• equipment,
• information,
• enclosure,
• indicator,
• energy,
• music,
• occurrence,
• form,
• converter,
• horn,
• event,
• material,
• measure,
• context,
• means,
• unit,
• space,
• bag,
• component,
• constant,
• disturbance,
• sensor,
• item,
• transducer,
• condition,
• style,
• foam,
• environment,
• data,
• result,
• quality,
• domain,
• analysis,
• sensation,
• genre,
• dimension,
• phenomenon,
• combination,
• track,
• quantity,
• function,
• radiator,
• artifact,
• source,

Members with property acoustic:

• piano,
• violin,
• engine_cover,
• wave_attenuation,
• banging,
• cello,
• station,
• guitar,
• change,
• fiddle,
• transient_change,
• music_signal,
• theater,
• flute,
• software_synthesiser,
• tambourine,
• whistling,
• aluminum,
• acoustic_echo,
• drum,
• mountain_dulcimer,
• rustling,
• specific_theme,
• organ,
• banjo,
• medium_room,
• wind_noise,
• mandolin,
• phone,
• lyre,
• delta_blues,
• hand,
• clarinet,
• harpsichord,
• absorption,
• violin_fiddle,
• resonance,
• helmholtz_resonator,
• amplifier,
• sax,
• voice_source,
• harmonium,
• membrane_microphone,
• ron_caravan,
• tune,
• line,
• bassoon,
• reed,
• sound-wave_reflection,
• accelerometer,
• auditory_signal,
• pop,
• syllable,
• phoneme,
• defect_crack,
• chamber_group,
• lamp,
• prosody,
• time_component,
• musical-instrument_sound,
• internal_loss,
• boot,
• high_sensitivity,
• cylinder,
• source,
• glockenspiel,
• sound_sensitivity,
• quartz-crystal_microbalance,
• fellow,
• pitch,
• recorder,
• cable_tv,
• bird_song,
• decay_time,
• sniper_shot,
• jingling_key,
• room,
• seismic_data,
• ensemble,
• tone_pip,
• humming,
• noise_data,
• early_reflection,
• end,
• field_recording,
• glass,
• gunshot,
• sewer,
• knocking,
• steel-drum_band,
• boundary,
• chime,
• spectral_shaping,
• cello_banjo,
• human_speech,
• stress,
• orchestra,
• waveguide,
• mineral_fibre,
• bamboo_flute,
• silence_information,
• polyester,
• muzzle_blast,
• wave_reflection,
• transfer_function,
• communication_call,
• leak,
• echolocation_sound,
• frequency_characteristic,
• folk_harp,
• damage,
• tongue_click,
• harp,
• torpedo-tube_flooding,
• audio_device,
• car_crash,
• shimmer,
• tampering,
• mandola,
• periodicity,
• tickling_sensation,
• repetition_period,
• piezoelectric_earphone,
• surface_wave,
• water_depth,
• sensitive_microphone,
• amplitude,
• sonar,
• environmental_vibration,
• environmental_information,
• panel_absorption,
• rise_time,
• clapping,
• street,
• room_size,
• ultrasound_energy,
• useful_information,
• hesitation,
• ney_flute,
• current,
• brass,
• ultrasound_sensor,
• solo,
• attenuation_characteristic,
• roulette,
• laughter,
• acoustic_transducer,
• ultrasonic_energy,
• speed,
• vocal_sound,
• chair_squeak,
• flaw,
• cow_horn,
• telephone_ringing,
• additive_noise,
• crimson_tower,
• acoustic_duo,
• fluency,
• sound_level,
• headphone,
• duct_resonance,
• brilliance,
• vibration,
• percussion_toy,
• practice_room,
• volume,
• bluegrass,
• harmonics,
• musical_signal,
• filtering_function,
• call,
• wall_reflection,
• diatonic_accordion,
• environmental_noise,
• intonation,
• repetition,
• loudness,
• fife,
• elastic_stiffness,
• contour,
• blast,
• microphone,
• siren,
• shot,
• marimba,
• water,
• particle_velocity,
• solid,
• stiffness,
• radiation_efficiency,
• sound_power,
• late_reverberation,
• burst,
• feature,
• organs,
• hand_drum,
• ordnance_burst,
• loud_call,
• violin_string,
• cellular_phone,
• sound,
• control,
• ukulele,
• acoustic_particle,
• band_concert,
• talker_pitch,
• button_accordion,
• ringing,
• spectrum_analysis,
• telephone,
• piano_jazz,
• musical_sound,
• keyboard_click,
• rhythm,
• pressure,
• longitudinal_wave,
• heating,
• void,
• hand_clap,
• drive,
• bass,
• acoustical_center,
• tempo,
• reverberation,
• vehicular_noise,
• rate,
• note_attack,
• soundproof_characteristic,
• noise_spectrum,
• trumpet,
• alarm,
• akan_trio,
• voice,
• tube,
• shape,
• equipment_noise,
• onset,
• counting,
• foot_steps,
• cadence,
• sound_distribution,
• hysteresis,
• timbre,
• matrix_cracking,
• repetition_rate,
• white_noise,
• voiced_speech,
• female_song,
• transponder,
• soprano_sax,
• key,
• warning_alarm,
• small_accordion,
• dry_source,
• vinyl_foam,
• cricket_display,
• ms,
• alarm_call,
• blockage,
• studio,
• stiffness_constant,
• simple_heating,
• various_guitar,
• attenuation,
• auditorium,
• intermittent_tapping,
• troll_cittern,
• distortion_characteristic,
• power_ra,
• radar,
• drape,
• acoustic_piano,
• keyboard,
• speaker_variation,
• dixieland_band,
• reed_brass,
• articulation,
• audio_signal,
• voiced_sound,
• trombone,
• trumpet_violin,
• kentucky_mandolin,
• hollow,
• spectral_content,
• transmission_loss,
• sonar_signal,
• clarity,
• speech,
• air,
• rallying_rate,
• flight_call,
• uptown,
• word,
• crackle,
• trio,
• washboard,
• frequency_component,
• explosion,
• drone,
• noise,
• recording_room,
• wind,
• equivalent,
• balalaika,
• vocal_jitter,
• communications_system,
• enclosure,
• clarity_index,
• acoustic_intensity,
• bell,
• vibes,
• frequency_range,
• upright_bass,
• tone_color,
• reverberance,
• rod_bell,
• bugle,
• loudspeaker,
• video,
• insect_sound,
• words,
• speech_data,
• radio,
• background,
• small_room,
• sonar_dome,
• tweeter,
• pure_tone,
• rollicking_fiddle,
• animal_footstep,
• timber,
• flamenco,
• horn,
• distance,
• pennywhistle,
• navigation_system,
• jazz,
• clavichord,
• second,
• fo_jitter,
• energy,
• voice_pitch,
• room_sound,
• complexity,
• propagation_constant,
• acoustic_velocity,
• buzzer,
• heavy_drapery,
• sound-pressure_component,
• balcony_enclosure,
• projector,
• presence,
• sound_transmitter,
• aforementioned_piano,
• volumetric_absorption,
• ground_reflection,
• string_banjo,
• mechanical_impact,
• theatre,
• traffic_noise,
• speaker_enclosure,
• speaker,
• street_noise,
• regularity,
• perturbation,
• vibrator_source,
• spectral_density,
• dulcimer,
• horn_mouthpiece,
• workplace,
• alto_sax,
• aircraft_noise,
• advertisement_call,
• release_burst,
• slide,
• frequency,
• temporal_parameter,
• directivity,
• rock,
• roosting_call,
• duration,
• duct,
• piezoelectric_devices,
• zither,
• grunt,
• commercial_music,
• tone,
• road_noise,
• key_tone,
• multiple_reflection,
• vibraphone,
• underwater_telephone,
• speech_signal,
• intensity,
• intercom,
• compressibility,
• cymbal,
• concertina,
• accordion,
• fabric,
• sound_speed,
• lap_steel,
• tonal_disturbance,
• warning_siren,
• violin_drum,
• contact_call,
• vowel_space,
• lcd_projector,
• reverberation_time,
• theft,
• speaker_part,
• reef_bombing,
• car_noise,
• phonetic_feature,
• classical_music,
• room_resonance,
• intelligibility,
• opener,
• loud_speaker,
• sam_trio,
• warning_tone,
• oboe,
• heart_sound,
• gun_shot,
• irish_pennywhistle,
• compressed_air,
• screen,
• oriental_instrument,
• solo_oboe,
• clatter,
• plastic,
• ship_shock,
• voice_sound,
• point,
• foam,
• density,
• sinusoidal_tone,
• saxophone,
• reflection,
• steel,
• earthquake_shock,
• sitar,
• windows,
• rale,
• classical_guitar,
• acoustic_waveguide,
• viola,
• strange_story,
• surface,
• velocity,
• threshold,
• handbell,
• contrabass,
• pitch_range,
• range,
• acoustic_speed,
• mobile_telephone,
• acoustic_foam,
• mineral,
• hand-clapping_sound,
• unvoiced_sound,
• woodwind,
• shop,
• ship_structure,
• ganglion,
• tenor_banjo,
• blues,
• ambient_noise,
• muffler,
• speech_rate,
• slide_guitar,
• brief_sound,
• opera,
• engine_sound,
• home,
• iron,
• small_bell,
• head,
• timing,
• foghorn,
• instrument,
• celtic_harp,
• pipe,
• time_history,
• radio-frequency_antenna,
• organ_keyboard,
• harmonica,
• music,
• room_temperature,
• travel_guitar,
• vocalic_onset,
• spatial_decay,
• receiver,
• choir,
• acoustic_pressure,
• transition,
• lute,
• bang,
• machinery_noise,
• church,
• jitter,
• prepared_zither,
• humidity,
• sound_quality,
• octave_mandola,
• temporal_variation,
• sound-pressure_level,
• sound_studio,
• home_theater,
• folk,
• earphone,
• horn_instrument,
• fish_finder,
• koto,
• toy,
• cocktail-party_condition,
• airport,
• stereo,
• acoustic_absorptivity,
• pace,
• mating_call,
• resonance_body,
• tuba,
• spectrum,
• articulatory_control,
• xylophone,
• squeal,
• acoustic_reflection,