This is the 7483rd most frequent Russian word.
декоративно
Decoratively.
Here, 'декоративно' describes the appearance of the vase, implying it is intended primarily for decoration.
Эта ваза выглядит декоративно.
This vase looks decorative.
In this case, 'декоративно' refers to the manner in which the room was decorated, emphasizing aesthetics.
Они украсили комнату декоративно.
They decorated the room decoratively.
Here, 'декоративно' qualifies how the painting of the glass is executed, indicating an intention to enhance visual appeal.