Shillelaghs are traditional Irish walking sticks, often made from a blackthorn tree. However, there are other terms that can be used to describe similar items. One such synonym is "cudgel," which refers to a stick used as a weapon or for self-defense. Another is "waddy," which is a term used for a heavy club made from hardwood, often used in Australia. "Quarterstaff" is another word that can be used to describe a long wooden staff used for fighting or walking. Finally, "baton" or "truncheon" can be used to describe similar items used by police or military personnel.