WordNet (r) 3.0 (2006):

water-color
    n 1: water-soluble pigment [syn: watercolor, water-color,
         watercolour, water-colour]
    2: a water-base paint (with water-soluble pigments); used by
       artists [syn: watercolor, water-color, watercolour,
       water-colour]
    3: a painting produced with watercolors [syn: watercolor,
       water-color, watercolour, water-colour]
    4: the art or technique of painting with watercolors [syn:
       watercolor, water-color, watercolour, water-colour]