The difference between Jackfish and Northern pike
When used as nouns, jackfish means a jack (in any of the senses referring to types of fish), whereas northern pike means a species of pike, esox lucius.
check bellow for the other definitions of Jackfish and Northern pike
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Jackfish as a noun:
A jack (in any of the senses referring to types of fish).
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Northern pike as a noun:
A species of pike, Esox lucius.