This is the 9683rd most frequent Russian word.
черноморскому
"Черноморскому" means "to the Black Sea" or "Black Sea (adjective, dative case)."
The word “черноморскому” serves as an adjective modifying “капитану” (captain), indicating that the captain is associated with the Black Sea.
Я писал письмо черноморскому капитану.
I was writing a letter to the Black Sea captain.
The word “черноморскому” functions as an adjective modifying “флоту” (fleet), denoting that the fleet is related to the Black Sea.
Она направила запрос черноморскому флоту.
She sent a request to the Black Sea fleet.
Here, “черноморскому” acts as an adjective modifying “курорту” (resort), specifying that the resort is located near the Black Sea.