Swansdowns are soft, fluffy feathers from a swan.
Swansdowns are delicate and beautiful, like the swans they come from.
Examples:
The princess's pillow was filled with swansdowns.
She wore a dress made of swansdowns.
The swansdowns floated gently on the water.
The cat thought the swansdowns were a toy.
The swansdowns were as light as a cloud.
The swansdowns made the bed feel like a dream.