* Aqua is Latin for "water".
* Adverbs describe verbs, adjectives, or other adverbs.
While "aqua" is used in many words related to water, like "aquatic" and "aquarium", these are adjectives, not adverbs.
There are no adverbs with the root "aqua" because the concept of water doesn't easily lend itself to describing actions or characteristics in the way adverbs do.