PNWS

*yamm- - sea (Fronzaroli 1968: 273, 288, 299; Kogan 2011: 191; Kogan 2015: 240)

Ugaritic
ym - sea (DUL 965)
Hebrew
yām - lake, sea (HALOT 413)
Syriac
yammā - sea, lake, swamp, marsh (LSyr. 303, SL 575)
Arabic
yamm- - tihāmat (sea) (LA 12 772)
almost certainly borrowed from Hebrew or Aramaic (Jeffery 1938:293).