Modifiers matching trouble:

• technical,
• psychological,
• mechanical,
• unforeseen,
• unexpected,
• economic,
• environmental,
• fatal,
• temporary,
• small,
• mental,
• real,
• major,
• financial,
• serious,
• internal,
• experienced,
• political,
• everyday,
• sexual,
• undesirable,

Simple categories matching mental:

• quantity,
• process,
• formation,
• state,
• control,
• care,
• activity,
• disease,
• stressor,
• causation,
• attitude,
• disorder,
• component,
• consideration,
• condition,
• factor,
• interference,
• stimulus,
• ability,
• status,
• health,
• event,
• fact,
• evidence,
• load,
• decline,
• development,
• performance,
• quality,
• study,
• hazard,
• abstraction,
• issue,
• symptom,
• attribute,
• energy,
• animal,
• feeling,
• faculty,
• injury,
• variable,
• parameter,
• filter,
• depression,
• perturbation,
• conflict,
• illness,
• operation,
• capability,
• agency,
• testing,
• competency,
• readiness,
• improvement,
• action,
• entity,
• medium,
• effort,
• help,
• nuisance,
• challenge,
• set,
• service,
• management,
• procedure,
• principle,
• attainment,
• emotion,
• conception,
• concept,
• pleasure,
• work,
• trait,
• suffering,
• mistake,
• problem,
• design,
• disposition,
• intrusion,
• values,
• stress,
• pathology,
• feature,
• difficulty,
• occurrent,
• measure,
• transformation,
• mammal,
• practice,
• sign,
• matter,
• skill,
• phenomenon,
• cruelty,
• trouble,
• game,
• treatment,
• pattern,
• production,
• gas,
• degradation,
• content,
• hindrance,
• task,
• mechanism,
• discomfort,
• trauma,
• image,
• object,
• noise,
• cause,
• sensation,
• model,
• adaptation,
• wellbeing,
• goal,
• initiative,
• impurity,
• use,
• impression,
• sound,
• crisis,
• thought,
• situation,
• strain,
• inquiry,
• cognition,
• carcinogen,
• culture,
• impairment,
• space,
• aberration,
• function,
• influence,
• life,
• sin,
• science,
• agent,
• exposure,
• constant,
• arts,
• stimulation,
• staff,
• body,
• notion,
• value,
• imagery,
• catastrophe,
• abnormality,
• act,
• exercise,
• occupation,
• modification,
• stage,
• program,
• discipline,
• abuse,
• representation,
• agitation,
• operations,
• labor,
• happening,
• change,
• character,
• power,
• knowledge,
• data,
• contaminant,
• relationship,
• organisation,
• grouping,
• reasoning,
• facility,
• unit,
• source,
• research,
• experience,
• malady,
• implementation,
• excitation,
• impact,
• preparation,
• processing,
• movement,
• upset,
• chemical,
• material,
• torture,
• information,
• elements,
• handicap,
• assets,
• system,
• endeavor,
• signal,
• equipment,
• distress,
• blockage,
• perception,
• constituent,
• aptitude,
• property,
• reaction,
• expenditure,
• behavior,
• inspiration,
• plan,
• structure,
• organization,
• confusion,
• disability,
• ailment,
• force,
• fault,
• shock,
• pain,
• cue,
• training,
• characteristic,
• concern,
• device,
• disturbance,