Mackerel vs. Sardine: What's the Difference?

Mackerel and Sardine Definitions
Mackerel
Any of various marine fishes of the family Scombridae, especially Scomber scombrus of the North Atlantic Ocean, a predatory food fish having dark wavy bars on the back and a silvery belly.
Sardine
Any of various edible fishes of the family Clupeidae that are frequently canned, especially small herrings of western Atlantic waters and Sardina pilchardus of European waters.
Mackerel
Any of various similar fishes, such as the horse mackerels.
Sardine
Any of various other small, silvery, edible freshwater or marine fishes.
Mackerel
Certain smaller edible fish, principally true mackerel and Spanish mackerel in family Scombridae, often speckled,
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Sardine
To pack tightly; cram
"The bars are sardined with hungry hopefuls" (Gael Greene).
Mackerel
Typically Scomber scombrus in the British isles.
Sardine
Any one of several species of small herring which are commonly preserved in olive oil or in tins for food, especially the pilchard, or European sardine Sardina pilchardus (syn. Clupea pilchardus). The California sardine Sardinops sagax (syn. Clupea sagax) is similar. The American sardines of the Atlantic coast are mostly the young of the Atlantic herring and of the menhaden.
Mackerel
A true mackerel, any fish of tribe Scombrini (Scomber spp., Rastrelliger spp.)
Sardine
(obsolete) carnelian
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Mackerel
Certain other similar small fish in families Carangidae, Gempylidae, and Hexagrammidae.
Sardine
(figurative) Someone packed or crammed into a small space.
Mackerel
(obsolete) A pimp; also, a bawd.
Sardine
To fish for sardines
Mackerel
A pimp; also, a bawd.
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Sardine
To pack or cram together tightly.
Mackerel
Any species of the genus Scomber of the family Scombridae, and of several related genera. They are finely formed and very active oceanic fishes. Most of them are highly prized for food.
Mackerel sky and mare's-tailsMake tall ships carry low sails.
Sardine
Any one of several small species of herring which are commonly preserved in olive oil for food, especially the pilchard, or European sardine (Clupea pilchardus). The California sardine (Clupea sagax) is similar. The American sardines of the Atlantic coast are mostly the young of the common herring and of the menhaden.
Mackerel
Flesh of very important usually small (to 18 in) fatty Atlantic fish
Sardine
See Sardius.
Mackerel
Any of various fishes of the family Scombridae
Sardine
Small fatty fish usually canned
Sardine
Any of various small edible herring or related food fishes frequently canned
Sardine
A deep orange-red variety of chalcedony
Sardine
Small fishes found in great schools along coasts of Europe; smaller and rounder than herring