Proto-Basque: *susun
Meaning: aspen, poplar
Bizkaian: zuzun
Comments: Cf. PNC *swɨ̆nē 'barberry, currants', reduplicated in Bsq *susun (cf. Lak sus < *suns). The Bsq-NC semantic commonality is ‘tree or shrub with berries’: Populus bears brown or reddish male fruit (catkins).