The word "throngest" means to gather in large numbers or to be crowded with people or things. There are several synonyms for this term including "swarm," "mass," "crowd," "flock," "assemble," "congregate," and "gather." Other similar words include "cluster," "herd," "mob," "pack," and "throng." Each of these words carries a slightly different connotation, but all convey the idea of many things or people coming together in a single location. Whether you are describing a crowded shopping mall or a bustling city street, these synonyms provide a useful way to add variety and interest to your writing.