blossom,
flower,
bloom reproductive organ of angiosperm plants especially one having showy or colorful parts
corolla (botany) the whorl of petals of a flower that collectively form an inner floral envelope or layer of the perianth; "we cultivate the flower for its corolla"
calyx (botany) the whorl of sepals of a flower collectively forming the outer floral envelope or layer of the perianth enclosing and supporting the developing bud; usually green