It is the same word Salonica or Thessaloniki or Thessalonica. You choose!
When I was there in '69, the locals called it Saloniki, though it was Thessalonica on our English map.
Thessaloniki is the name of Aexander's the Great sister and the city was called in her favor. Over the years many cultures lived in the area like the Hebrews from Spain and the Slavs. Remember that Thessaloniki was occupied for almost 500 years by the Turks. The names used during the period are Solun, Salonica, Saloniki. After the city's libetration in 1912 the official name was brought in use and the majority refers to that. Some locals still call Saloniki their city.
Kingdom of Thessalonica was created in 1204.
Kingdom of Thessalonica ended in 1224.
Thessaloniki was created in -315.
Near Thessaloniki is the Aegean Sea.
Aris Thessaloniki was created in 1914.
Demetrius of Thessaloniki was born in 270.
Demetrius of Thessaloniki died in 306.
Yes. The place is nowadays normally referred to as Thessaloniki.
Bucharest-Thessaloniki: 675 km
War Museum of Thessaloniki was created in 2000.
Railway Museum of Thessaloniki was created in 2001.