This is the 6535th most frequent Japanese word.
チェコ
Czech (referring to the Czech Republic).
Here, 'チェコ' is used as the name of the country Czechia.
チェコは美しい国です。
Czechia is a beautiful country.
In this context, 'チェコ' is used as an adjective to describe the culture related to Czechia.
彼はチェコの文化にとても興味があります。
He is very interested in Czech culture.
Here, 'チェコ' indicates the nationality or origin of a person, signifying that they come from Czechia.