Containerful refers to a quantity or amount that can be contained within a container. However, there are several synonyms that can be used instead of this word. Some of them are vessel, receptacle, holder, crate, box, canister, barrel, drum, bucket, tub, and tank. These words are commonly used to describe different types of containers for various purposes. For instance, a vessel may refer to a ship or boat that transports goods. On the other hand, a canister is typically used for storing and dispensing gases. It is important to use the appropriate synonym depending on the context of the sentence to ensure accurate communication.