Lord Tirek is a fictional character from the animated television show "My Little Pony: Friendship is Magic." As a major antagonist in the series, there are several synonyms that could describe him. One such term could be "villain," as Tirek is known for his evil and often ruthless actions. Another synonym could be "antichrist," as his ultimate goal is to take over all of Equestria by absorbing the magic of the ponies there. Additionally, "power-hungry" could be an applicable term, as Tirek is constantly seeking to increase his magical abilities and dominion over others. Other synonyms for Tirek might include "malevolent," "sinister," or simply "evil".