Lilac
Part of speech: noun
Definition: a large shrub bearing white, pale pink or purple flowers. lilac flowers (colour) a pale purple colour, the colour of some lilac flowers.
Part of speech: adjective
Definition: (colour) having a pale purple colour.
Lavender
Part of speech: noun
Definition: Any of a group of European plants, genus, Lavandula, of the mint family.a pale purple colour, like that of the lavender flower.
Part of speech: adjective
Definition: having a pale purple colour.