gwed : green
The Fennas word for green is gwed.
How did I come up with this word? The Welsh word for green is gwyrdd or glas, the Irish word for green is glas or uaine (vivid green), and the Breton word for green is glas or gwer (artifical green). It's interesting to note that glas is a very broad Celtic color term for a darker color, which also means blue and sometimes gray.
Previously my Fennas word for green was gair and glyes.