tsar |zɑːr| — a male monarch or emperor (especially of Russia prior to 1917)

tsarevich |ˈzɑːrɪvɪtʃ| — a son of a tsar, a prince in Russia or Bulgaria

tsarevitch  — Alternative spelling of tsarevich.

tsarina |zɑːˈriːnə| — the wife or widow of a czar

tsetse |tˈsiːtsɪ| — bloodsucking African fly; transmits sleeping sickness etc.

tsunami |tsuːˈnɑːmɪ| — a cataclysm resulting from a destructive sea wave caused by an earthquake or volcanic eruption