As nouns the difference between lavender and heather
is that
lavender is any of a group of European plants, genus,
Lavandula, of the mint family while
heather is an evergreen plant, species: Calluna vulgaris, with spiky leaves and small purple, pink, or white flowers.
As adjectives the difference between lavender and heather
is that
lavender is having a pale purple colour while
heather is of a purple colour with a tint with pink and blue.
As a proper noun Heather is
{{given name|female|from=English}}.