The term "big berthas" mostly refers to large, high-caliber guns, especially those used in military or warfare operations. However, there are various synonyms for this term, depending on the context and usage. Heavy artillery, massive armaments, giant cannons, monster guns, behemoth weapons, and colossal armament are some of the common synonyms used to describe the same. These synonyms emphasize the size, power, and destructive potential of the large guns and armaments that are commonly referred to as "big berthas." The term is often used to depict strong and powerful entities that are difficult to tackle or overpower, incorporating fear and strength all the same.