The difference between Northern pike and Pike

Northern pike as a noun:

A species of pike, Esox lucius.

Pike as a noun (military, historical):

A very long spear used two-handed by infantry soldiers for thrusting (not throwing), both for attacks on enemy foot soldiers and as a countermeasure against cavalry assaults.

Pike as a noun:

A sharp point, such as that of the weapon.

Pike as a noun:

A large .

Pike as a noun:

Any carnivorous freshwater fish of the genus Esox, especially the northern pike, Esox lucius.

Pike as a noun (diving, gymnastics):

A position with the knees straight and a tight bend at the hips with the torso folded over the legs, usually part of a jack-knife.

Pike as a noun (fashion, dated):

A pointy extrusion at the toe of a shoe.

Pike as a noun (chiefly, Northern England):

Especially in place names: a hill or mountain, particularly one with a sharp peak or summit.

Pike as a noun (obsolete):

A pick, a pickaxe.

Pike as a noun (obsolete, Britain, dialectal):

A hayfork.

Pike as a noun (obsolete, often, euphemistic):

A penis.

Pike as a verb (transitive):

To prod, attack, or injure someone with a pike.

Pike as a verb (ambitransitive, diving, gymnastics):

To assume a pike position.

Pike as a verb (intransitive, gambling):

To bet or gamble with only small amounts of money.

Pike as a verb (intransitive, Australia, New Zealand, slang):

Often followed by or : to quit or back out of a promise.

Pike as a noun:

Pike as a noun (derogatory, slang):

A gypsy, itinerant tramp, or traveller from any ethnic background; a pikey.

Pike as a verb (intransitive):

To equip with a turnpike.

Pike as a verb (intransitive, obsolete, Britain, thieves' cant):

To depart or travel (as if by a turnpike), especially to flee, to run away.