We don't have synonyms for tri-cities yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are tri cities, trinities and triunities.
(N) :
The name Tri-Cities refers to two regions in the U.S. state of Michigan.
(N) :
an informal grouping of the three adjacent suburban cities of Coquitlam, Port Coquitlam, and Port Moody, along with the two villages of Anmore and Belcarra in the northeast sector of Metro Vancouver in British Columbia.
(N) :
The name Tri-Cities refers to two regions in the U.S. state of Michigan.
(N) :
an informal grouping of the three adjacent suburban cities of Coquitlam, Port Coquitlam, and Port Moody, along with the two villages of Anmore and Belcarra in the northeast sector of Metro Vancouver in British Columbia.