This is the 9032nd most frequent Japanese word.
海友
"海友" (かいゆう, kaiyū) translates to "sea friend" or "friend of the sea."
The word 海友 here refers to a particular person (or entity) named Umiyuu, emphasizing their unique significance to the speaker.
海友は私にとって特別な存在です。
Umiyuu is a special presence to me.
In this sentence, 海友 represents the name given to a ship, suggesting symbolic or literal naming.
海友という名前がついている船を見ました。
I saw a ship named Umiyuu.
Here, 海友 is used as a conceptual term that embodies a sense of companionship related to the sea, representing an abstract idea or societal concept.