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West Frisian wetter
Proto-Germanic *watōr (inherited)
Proto-West Germanic *watar (inherited)
Proto-Indo-European *wódr̥ (inherited)
Old Frisian weter (inherited)

English water (cognate)
North Frisian weeder (mention)
North Frisian wååder (mention)
North Frisian Weeter (cognate)
West Frisian wetterstof (compound)
West Frisian drinkwetter (compound)
West Frisian wetterich (affix)
West Frisian wetterwei (affix)
West Frisian seewetter (compound)
Scots watter (cognate)
Saterland Frisian Woater (cognate)