When it comes to the antonyms of the word "logjam," it can be quite challenging to identify perfect opposites. Nonetheless, some conceivable choices include the words "flow," "pace," "movement," or "progress." These terms indicate a dynamic and fluid motion or progression of events, which is the opposite of the stasis associated with a logjam. Other antonyms that could work include words like "unhampered," "unobstructed," or even "smooth sailing." These words carry connotations of a free and smooth pathway from start to finish, indicating again how different they are from the cluster and stagnation represented by a logjam.