The term "seed vessel" refers to the reproductive structure of a plant that contains seeds. There are various synonyms for this term, including seed pod, seed case, fruit, capsule, and silique. Seed pod is a common synonym, which is used to describe the outer covering of the seed that protects it from external factors and aids in its dispersal. Seed case is a more formal term that is often used in scientific literature to describe the outer layer of the seed. Fruit is a broader synonym that refers to any matured ovary of a flowering plant, while capsule describes a dry fruit that splits to release its seeds. Silique is a specific type of capsule found in plants belonging to the mustard family that split open on two sides to release their seeds.