complete flowers are always perfect flowers, which contain male and female parts. However, not all perfect flowers are complete, as perfect flowers may have both pistils and stamen but lack sepals and petals.
Ex. Rose (Rosa rubiginosa)
BISEXUAL OR HERMAPHRODITE- These flower has both the essential floral organs. IMPERFECT OR UNISEXUAL FLOWER- These flower has only one of the two essential floral organs.
Ex. Sunflower ( Helianthus annuus L.)