異彩[isai] conspicuousness (usu. color)
五彩[gosai] the five colours: green, yellow, red, white and black
光彩[kousai] brilliance
彩り[irodori] coloring
彩る[irodoru] to colour

彩色[saishiki] colouring
彩度[saido] chroma
色彩[shikisai] colour
水彩画[suisaiga] watercolor painting
多彩[tasai] variegated