Swyddogaeth, n. office, duty
Swyddogi, v. to hold office
Swyddwr, n. an officer
Swyf, n. scum; yeast; suet
Swyfedd, n. what is scummed, suet
Swyfen, n. scum; froth, or top
Swyfi, n. scum; froth, or top
Swyfo, v. to cast a scum; to yeld
Swylo, v. to save, to put by
Swyn, n. a preservative; a charm