What is a verb for mar/mer and an adverb that starts with aqua/aqu? (they have to do with water)

The verb commonly is use for mar is 'marred' and adverb for aqua is aquatic or aqua cultural.

Explanation:

A verb conveys an action happening or in the process of being happened. It always contains a root word that more often than not has its own meaning which is separately derived from what it means as a verb.

Thus, to mar is to destroy and so is the meaning of the verb 'Marring'.

The adverb is something that is accompanied to the verb and describes it like an adjective. It also has a root word that conveys the word but its meaning is derived by the non root word.

Thus, aquatic is an adverb that can describe or find the subject to a verb.