"Hadst it" is an archaic word that is no longer in use in modern English. However, there are many synonyms for this word that can be used in contemporary language. Some of these synonyms include "owned it," "possessed it," "acquired it," "had it in one's possession," "held it," and "controlled it." These words are all similar in meaning and could be used interchangeably depending on the context in which they are being used. Whether it's talking about physical possessions or abstract concepts such as power or influence, there are many other words that can be used to replace "hadst it" and convey the intended meaning with greater clarity.