I have been learning Cymraeg (South) for a couple of years and have come across several differences is word usage and some structural differences between Northern and Southern Welsh. There may be some differences, that I am not aware of, between East and West Welsh . Much like the differences that exist between American and British English. I have listed below some of the difference I have noticed. Please share differences in Welsh Dialects that you are aware of.
South North
Like hoffi licio
Finish cwpla gorffen
With me gyda fi geni i
Can (able to) gallu medru
Want moyn eisiau
Milk llaeth llefrith
Need eisiau angen
Pub Tafarn pyb
Fall cwympo disgyn
Out mas allan
Wake (up) dihuno deffro
Away bant ffwrdd
Concern (worried)becso poeni
Return mynd nol dychwelyd
Go home gytre adre
Now nawr rwan
Grandmother mam-gu nain
Know gwbod gwybod
updated by @brett-hull: 12/15/15 07:21:02PM