Coethiad, n. stimulation; a refining
Coethiedydd, n. a purifier
Coethol, stimulating; refining
Coethwr, n. a purifier
Côf, n. memory; record
Cofel, n. a memorial
Cofiad, n. a remembering
Cofiadur, n. a remembrancer, a recorder, a secretary
Cofiadwy, a. memorable
Cofiant, n. memoir, record