Modifiers matching reward:

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

Simple categories matching fluctuating:

• payment,
• condition,
• disease,
• quantity,
• force,
• reward,
• mode,