Cebu vs Cebu City

Cebu and Cebu City both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cebu	Yes	No	No	No
Cebu City	Yes	No	No	No

As nouns, Cebu and Cebu City are synonyms defined as:

Cebu and Cebu City: an important seaport on the island of Cebu in the Philippines

Cebu (noun)	Cebu City (noun)
an important seaport on the island of Cebu in the Philippines	an important seaport on the island of Cebu in the Philippines
one of the Visayan islands of the central Philippines; important for its fine harbor