Simple categories matching rewarding:

• activity,
• thing,
• experience,
• stimulus,
• behavior,
• industry,
• job,
• object,
• drug,
• goal,
• event,
• substance,

Members with property rewarding:

• food,
• brain_stimulation,
• opiate,
• game,
• water,
• camping,
• oral,
• play,
• homework,
• alcohol,
• further_example,
• morphine,
• exercise,
• sex,
• teaching,
• prize_drawing,
• sexual_behavior,
• outdoor_work,
• teaching_english,
• cookie,
• apple,
• cocaine,
• methamphetamine,
• mescaline,
• raisin,
• continuing_education,
• retirement,
• use,
• work,
• substance_use,
• physical_proximity,
• food_delivery,
• culture_night,
• design,
• relaxation,
• mole_scan,
• nicotine,
• glossary_building,
• committee_work,
• wafer_production,
• dust_bathing,
• benzodiazepine,
• child_rearing,
• lecture,
• partner,
• childcare,
• farming,
• playing_chess,
• exploration,
• cocaine_consumption,
• gardening,
• leisure,
• marriage,
• several_benzodiazepine,
• social_interaction,
• housework,
• reading,
• cannabis,
• transportation,
• amphetamine,
• finding_target,
• drug,
• textured_foot,
• drawing,
• logistics,
• business,
• basketball,
• physics,
• mathematics,
• red,
• teaching_cs,
• database_maintenance,
• watercolor_painting,
• acupuncture,
• playing_outside,
• heroin_use,
• support,
• volunteer_work,
• archery,
• gambling,
• foraging,
• entertainment,
• feeding,
• memoir_writing,
• familiar_food,
• shopping,
• pursuing_dream,
• sucrose_drinking,
• palatable_food,