落差

luòchā
  1. drop in elevation
  2. (fig.) gap (in wages, expectations etc)
  3. disparity

CEDICT

Entry Composition

1 落 luò
  1. to fall or drop
  2. (of the sun) to set
  3. (of a tide) to go out
  4. to lower
  5. to decline or sink
  6. to lag or fall behind
  7. to fall onto
  8. to rest with
  9. to get or receive
  10. to write down
  11. whereabouts
  12. settlement
2 差 chā
  1. difference; discrepancy
  2. (math.) difference (amount remaining after a subtraction)
  3. (literary) a little; somewhat; slightly