Main Difference
The main difference between Haddock and Halibut is that the Haddock is a Merlangius euxmus and Halibut is a common name, for edible fishes
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Haddock
The haddock (Melanogrammus aeglefinus) is a saltwater fish from the family Gadidae, the true cods, it is the only species in the monotypic genus Melanogrammus. It is found in the North Atlantic Ocean and associated seas where it is an important species for fisheries, especially in northern Europe. It is also an important food fish and it is marketed fresh, frozen and smoked; smoked varieties include the Finnan haddie and the Arbroath smokie.
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Halibut
Halibut is a common name principally applied to the two flatfish in the genus Hippoglossus from the family of right-eye flounders. Less commonly, and in some regions only, other species of flatfish are also referred to as being halibuts. The word is derived from haly (holy) and butte (flat fish), for its popularity on Catholic holy days. Halibut are demersal fish and are highly regarded as a food fish.
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Haddock (noun)
A marine fish, Melanogrammus aeglefinus, of the North Atlantic, important as a food fish.
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Halibut (noun)
A large flatfish of the genus Hippoglossus, which sometimes leaves the ocean floor and swims vertically.
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Haddock (noun)
a silvery-grey bottom-dwelling fish of North Atlantic coastal waters, related to the cod. It is popular as a food fish and is of great commercial value.