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

お生憎様[oainikusama] that's too bad (ironical)
御誕生日おめでとうございます[otanjoubiomedetougozaimasu] Happy Birthday
隣の芝生は青い[tonarinoshibafuhaaoi] the grass is always greener on the other side
生きがいい[ikigaii] fresh (e.g. fish)
コンピューター援用生産[konpyuutaaenyouseisan] computer-aided manufacture

委託生[itakusei] scholarship student sent by government office or business
生す[nasu] to build up
異常発生[ijouhassei] plague
医学生[igakusei] medical student
医学生物学[igakuseibutsugaku] medical biology