Hijinks, often used to describe playful misbehavior or mischief, is a fun word to say and write. However, if you find yourself overusing it, there are many synonyms you can use instead. Some examples include shenanigans, antics, tomfoolery, clowning around, practical jokes, capers, monkey business, skylarking, and horseplay. These words can add variety and nuance to your writing or speech, and help you avoid repeating yourself. Just make sure to use them appropriately, as some have slightly different connotations. For instance, shenanigans often imply trickery or deception, while capers are more adventurous or daring.