"Reassume" is a action of taking back or resuming something that was previously possessed. Some possible synonyms for "reassume" include "reclaim," "repossess," "retrieve," "regain," "take back," "recover," "reoccupy," "reacquire," "reopen," "resume," or "continue." All of these terms indicate a process of returning to a previous state or position, with the implication that something has been lost, temporarily stopped, or put on hold. Depending on the context, any of these synonyms might be more or less appropriate for conveying the specific connotations of "reassume".