What are the comparative and superlative word of colorful?

There isn't a direct comparative or superlative form for "colorful" in the traditional sense. It's not a word that describes something on a scale of intensity.

However, you can express similar meanings using different words or phrases:

More Colorful:

* More vibrant

* More varied

* More vivid

* More richly colored

* More chromatically diverse

Most Colorful:

* Most vibrant

* Most varied

* Most vivid

* Most richly colored

* Most chromatically diverse

* A kaleidoscope of colors

* A riot of colors

* A rainbow of colors

The best choice will depend on the specific context and the nuance you want to convey.