Is dew and water vapour the same?
Let's have a look at the definitions of dew:


  dew (the free dictionary)
  
  
  Water droplets condensed from the air, usually at night, onto cool surfaces.
  Something moist, fresh, pure, or renewing: "The timely dew of sleep / ... inclines / Our eye-lids" (John Milton).
  Moisture, as in the form of tears or perspiration, that appears in small drops.
  


Therefore dew is water in the condensed phase, i.e. liquid. Water vapour on the other hand is the gaseous phase. They are definitely not the same.