N    - (N can be a mutation of D, and "Ngh" can be a mutation of C)
Word element
MeaningExample of use
(sound file links underlined)
nant, (plural nentydd, nannau)brookNantgaredig
newyddnewCas-newydd (Newport)

  O
Word element
MeaningExample of use
(sound file links underlined)
odynkiln 
onnen, (plural onn,ynn)ash treeCraft-yr-onnen