Lilac vs. Buddleia: What's the Difference?

Lilac and Buddleia Definitions
Lilac
Any of various shrubs of the genus Syringa, especially S. vulgaris, which has been widely cultivated for its clusters of fragrant flowers that are usually purplish or white but may be pink, blue, or creamy yellow depending on the cultivar.
Buddleia
See butterfly bush.
Lilac
A pale to light or moderate purple.
Buddleia
A tree or shrub of the genus Buddleja, especially Buddleja davidii, a large ornamental shrub whose lilac flowers attract butterflies.
Lilac
A large shrub of the genus Syringa, especially Syringa vulgaris, bearing white, pale-pink, or purple flowers.
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Buddleia
Tropical shrub having clusters of white or violet or yellow flowers
Lilac
A flower of the lilac shrub.
Lilac
(color) A pale purple color, the color of some lilac flowers.
Lilac
Having a pale purple colour.
Lilac
A shrub of the genus Syringa. There are six species, natives of Europe and Asia. Syringa vulgaris, the common lilac, and Syringa Persica, the Persian lilac, are frequently cultivated for the fragrance and beauty of their purplish or white flowers. In the British colonies various other shrubs have this name.
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Lilac
A light purplish color like that of the flower of the purplish lilac.
Lilac
Any of various plants of the genus Syringa having large panicles of usually fragrant flowers
Lilac
Of a pale purple color