Modifiers matching observer:

• trained,
• contemporary,
• foreign,
• objective,
• naive,
• primary,
• careful,
• everyday,
• concerned,
• external,
• independent,
• lay,
• outside,
• impartial,
• special,
• professional,
• interested,
• dedicated,
• key,
• inexperienced,
• familiar,
• unofficial,
• responsible,
• knowledgeable,
• influential,
• casual,
• social,
• skilled,
• experienced,

Simple categories matching trained:

• individual,
• technician,
• scientist,
• professional,
• intellectual,
• adult,
• worker,
• person,
• specialist,
• artist,
• user,
• volunteer,
• operator,
• clientele,
• unit,
• therapist,
• observer,
• practitioner,
• troops,
• doctor,
• physician,
• mediator,
• dentist,
• animal,
• expert,
• advocate,
• interpreter,
• supervisor,
• educator,
• people,
• employee,
• staff,
• personnel,
• agent,
• adviser,
• researcher,
• woman,
• group,
• works,