This is the 6549th most frequent Japanese word.
チュニジア
Tunisia (a country in North Africa).
Here, チュニジア is used as a subject in the sentence to denote the country Tunisia.
チュニジアは北アフリカの国です。
Tunisia is a country in North Africa.
In this sentence, チュニジア is used as an object to indicate the place visited by the speaker.
私は先月チュニジアを訪れました。
I visited Tunisia last month.
Here, チュニジア is used as an adjective modifier to describe the type of cuisine.