Cackleberry is a slang term for egg, particularly the ones used for breakfast. However, there are several synonyms for the words that one can use in place of cackleberry. Some of the synonyms include hen fruit, ovum, embryonic, and ovoid. The word hen fruit originates from the fact that hens lay eggs, while ovum is the scientific term for an egg. Embryonic suggests that the egg is still in the developmental stage, while ovoid is used to describe the oval shape of an egg. Using these synonyms can add variety to one's vocabulary and make the language more interesting.