This is the 494th most frequent Arabic word.
تونس
Tunisia (a country in North Africa).
Here, 'تونس' refers to the capital city of Tunisia.
زرتُ مدينة تونس في الصيف.
I visited the city of Tunis in the summer.
In this context, 'تونس' refers to the country Tunisia.
تونس بلد جميل مليء بالأماكن السياحية.
Tunisia is a beautiful country full of tourist destinations.
Here, 'تونسية' (derived from 'تونس') functions as an adjective describing the flowers as Tunisian.