cat (cad) => cadyawr (f) : battle, a battalion
pysc (pysg) => pyscawt (m) : fish
gorwyd (gorwydd) (m) => gofwydawt : steed, warhorse
pryf => pryvet (pryved) (m) : worm
merch => merchet (merched) (f) : daughter
bys => byssed (byssedd) (m) : finger
dant => danned (dannedd) (m) : tooth
gwreic (gwreig) => gwraged (gwaragedd) (f) : woman
mil : mileit (mileid) (m) : animal
barwn => barwneit/barwnyeit (barwneid/barwnyeid) (m) : baron
llestyr (lestr) => llestri (m) : vessel
cawr => cewri (m) : giant
saer => seiri (m) : artificer, craftsman
hyd (hydd) => hyddot (hyddod) (m) : stag
llwdn => llydnot (llydnod) (m) : beast
mor => moroed (moroedd) (m) : sea
ieith => ieithoed (ieithoedd/ieitheu) (f) : language
avon (afon) => avonyd (afonoedd) (f) : stream
gwlat (gwlad) => gwledyd (gwledoedd/gwledi) (f) : country
chwaer => chwioryd (chwioerydd) (f) : sister
Strachan, Introduction, § 28