Bohai Sea vs Bo Hai

Bohai Sea and Bo Hai both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bohai Sea	Yes	No	No	No
Bo Hai	Yes	No	No	No

As nouns, Bohai Sea and Bo Hai are synonyms defined as:

Bohai Sea and Bo Hai: an inlet of the Yellow Sea, on the coast of Eastern China

Other synonyms of Bohai Sea include Po Hai.

Bohai Sea (noun)	Bo Hai (noun)
an inlet of the Yellow Sea, on the coast of Eastern China	an inlet of the Yellow Sea, on the coast of Eastern China