Chockablock is a word that is commonly used to describe something that is completely full or packed to capacity. However, there are several other synonyms that can be used to convey the same message. Some of the popular alternatives to "chockablock" include "jam-packed," "crammed," "stuffed," "overflowing," "brimming," and "teeming." Each of these words effectively depicts a situation where something is filled to the brim. So the next time you want to describe a crowded space, consider using one of these synonyms to bring more variety and richness to your vocabulary.