Modifiers matching vocalization:

• complicated,
• positive,
• emotional,
• complex,
• animal,
• unique,
• involuntary,

Simple categories matching involuntary:

• movement,
• emotion,
• activity,
• creditor,
• association,
• cause,
• claim,
• response,
• process,
• vocalization,
• measure,
• event,
• action,
• departure,
• organs,
• change,
• tissue,
• unemployment,
• control,
• reflex,
• circumstance,
• motion,
• situation,
• exchange,
• reaction,
• muscle,
• thing,
• act,
• function,
• termination,
• force,