The word 'jostler' refers to a person who pushes or bumps into others in a crowd or a person who aggressively seeks to advance their agenda. There are several synonyms for this word, including pusher, nudger, shover, hustler, bruiser, elbower, and bulldozer. Each of these words highlights a slightly different aspect of the behavior of a 'jostler.' For example, 'pusher' emphasizes the physical component of the behavior, while 'bulldozer' suggests a more forceful, determined approach. Regardless of the specific synonym used, all these words convey a sense of aggression and/or physicality in intruding on others' personal space or boundaries.