The Gambia vs Gambia

The Gambia and Gambia both are nouns.

Word	Noun	Adjective	Verb	Adverb
The Gambia	Yes	No	No	No
Gambia	Yes	No	No	No

As nouns, The Gambia and Gambia are synonyms defined as:

The Gambia and Gambia: a narrow republic surrounded by Senegal in West Africa

Other synonyms of The Gambia include Republic of The Gambia.

The Gambia (noun)	Gambia (noun)
a narrow republic surrounded by Senegal in West Africa	a narrow republic surrounded by Senegal in West Africa