Modifiers matching reward:

• fluctuating,
• indirect,
• financial,
• tangible,
• personal,
• everyday,
• valuable,
• motivational,
• social,
• psychological,
• visible,
• annual,
• individual,
• practical,
• external,
• offer,
• direct,
• organizational,
• promotional,
• additional,
• internal,
• special,
• lower,
• smaller,
• primary,
• traditional,
• intrinsic,
• economic,
• variable,
• complex,
• immediate,
• institutional,
• positive,
• monetary,
• complimentary,
• exciting,
• emotional,
• extrinsic,
• out,
• common,

Simple categories matching lower:

• hydrocarbon,
• vertebrate,
• fish,
• plant,
• reptile,
• organism,
• teleost,
• level,
• invertebrate,
• area,
• animal,
• reward,
• bird,
• amniote,
• mammal,
• species,
• microorganism,
• part,
• food,
• emotion,
• state,
• tracheophyte,
• chordate,
• expense,
• energy,
• body,
• limb,
• eukaryote,
• quality,
• unit,
• extremity,
• meat,
• creature,
• thing,
• alcohol,
• group,