Synonyms for the word "supererogatorily" include excessively, profusely, lavishly, and abundantly. The term "supererogatorily" refers to actions that go above and beyond what is expected or required. If someone is doing something supererogatorily, they are doing more than what is necessary or expected of them. Using synonyms like excessively, profusely, lavishly, and abundantly can help to convey a similar meaning in a more accessible way. These words can be used to describe actions that are done in a generous or extravagant manner, or to describe a person who is going above and beyond what is asked of them.