Source : Webster's Revised Unabridged Dictionary (1913)

Enhancer \En*han"cer\, n.
   One who enhances; one who, or that which, raises the amount,
   price, etc.

Source : WordNet®

enhancer
     n : anything that serves by contrast to call attention to
         another thing's good qualities; "pretty girls like plain
         friends as foils" [syn: {foil}]