This appears to be a misspelling or variant of corvette, a small, fast warship or a sports car.
The standard spelling is corvette, from French corvette, possibly from Dutch korf 'basket.' If 'corvktte' exists, it may be an obsolete or regional spelling variant.
This might be a typographical quirk or very rare historical variant—most sources standardized on 'corvette' by the 18th century, so if you encounter 'corvktte,' you're probably looking at an old manuscript.
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