WordNet sense 1 (water chestnut whose spiny fruit has two rather than 4 prongs):

ling ko, Trapa bicornis

WordNet sense 2 (common Old World heath represented by many varieties; low evergreen grown widely in the northern hemisphere):

broom, heather, Calluna vulgaris, Scots heather

WordNet sense 3 (elongated marine food fish of Greenland and northern Europe; often salted and dried):

Molva molva

WordNet sense 4 (elongate freshwater cod of northern Europe and Asia and North America having barbels around its mouth):

eelpout, burbot, cusk, Lota lota