I personally really like to use the word overmorrow. It is convenient to use, and much shorter compared to the traditionally used the day after tomorrow.
However, according to this answer the word has become obsolete in the dictionary after 1913. And is not used in modern English language.
My question is: how would one, hypothetically speaking, go about reintroducing words that have become obsolete? Are there examples of words that had become obsolete and have been reintroduced? If so, how did this happen?