An early spelling of carbuncle which derives from the Latin for a small piece of coal and was used in the Middle Ages of a fiery red precious stone, a ruby.
An early spelling of cheese-vat, the vessel in which the curds were pressed and moulded, described by Peter Brears as a cylindrical cooper-made implement.
In the 1400s and 1500s this was a relatively common spelling of chimney in the West Riding although I have found no reference to its use in major dictionaries.