A king size bed is a large, comfortable bed that provides ample space for a pleasant sleeping experience. However, there are several synonyms for the term 'king size bed' that you can use to add variety to your descriptions. For instance, a 'California king' is an oversized bed that provides additional length for tall people. A 'super king' is another synonym that refers to a bed that is even larger than a standard king size. 'Goliath size', 'emperor size', and 'grand king' are other synonyms that you can use to describe a luxurious, spacious bed fit for a king.