Category Nuances for null:

• educational,
• artistic,
• creative,
• noncompetitive,
• disruptive,
• extracurricular,
• musical,
• physical,
• profitable,
• gynecologic,
• external,
• underlying,
• professional,
• positive,
• voluntary,
• fine,
• theatrical,
• strategic,
• natural,
• temporary,
• organized,
• free,
• related,
• institutional,
• regulated,
• ethical,
• maladaptive,
• social,
• experiential,
• outside,
• personal,
• chemical,
• complimentary,
• cultural,
• unlawful,
• beneficial,
• interesting,
• aesthetic,
• exciting,
• sinful,
• public,
• prestigious,
• vocal,
• desired,
• diverse,
• limited,
• mundane,
• cellular,
• technical,
• advisory,
• traditional,
• incidental,
• important,
• strenuous,
• strong,
• physicochemical,
• specialized,
• big,
• useful,
• dangerous,
• immoral,
• oral,
• gi,
• odd,
• insignificant,
• physiological,
• lucrative,
• essential,
• mental,
• functional,
• unrelated,
• informal,
• skilled,
• healthy,
• light,

Simple Categories for null:

• practice,
• communication,
• endeavor,
• activity,
• activation,
• training,
• field,
• subject,
• thing,
• behaviour,
• ability,
• matter,
• support,
• experience,
• arts,
• effort,
• action,
• work,
• procedure,
• amount,
• attribute,
• entity,
• occupation,
• discipline,
• endeavour,
• operation,
• behavior,
• job,
• study,
• outlet,
• domain,
• use,
• process,
• measure,
• production,
• conduct,
• works,