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Czech
A West Slavic language closely related to Slovak — official in the Czech Republic and famed for the unique "ř" consonant heard nowhere else.
You're looking for 5-letter languages containing C — here are 3 matches, each linked to a full profile.
List of 5-letter Languages that contain C
2
Dutch
A West Germanic language sitting between English and German in many features — official in the Netherlands, Belgium (Flanders), and Suriname.
3
Yuchi
A language isolate of the Yuchi people of Oklahoma — once spoken across the southeastern United States, now critically endangered.
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