J

jabberwocky (noun)
Invented or meaningless language; nonsense. (OD)
Meaningless speech or writing. (MW)

jar (noun)
British informal:  A glass of beer. (OD)

jetsam (noun)
The part of a ship, its equipment, or its cargo that is cast overboard to lighten the load in time of distress and that sinks or is washed ashore. (MW)
Unwanted material or goods that have been thrown overboard from a ship and washed ashore, especially material that has been discarded to lighten the vessel. (OD)
Example:  A notebook filled with flotsam and jetsam.
See:  flotsam, flotsam and jetsam

jizya or jizyah (noun)
Arabic:  A capitation tax formerly levied on non-Muslims by an Islamic state. (MW)
See:  dhimmitude

juggernaut (noun)
A huge, powerful, and overwhelming force or institution. (OD)
A massive inexorable force, campaign, movement, or object that crushes whatever is in its path. (MW)
A large powerful force or organization that cannot be stopped.  A very large and powerful company, organization, or industry. (CD)
Something that is very powerful, especially something that has a bad effect. (MD)
If you describe an organization or group as a juggernaut, you are critical of them because they are large and extremely powerful, and you think they are not being controlled properly.  Any terrible force, especially one that destroys or that demands complete self-sacrifice.  Anything that exacts blind devotion or terrible sacrifice.  Any relentless, destructive, irresistible force.  Anything requiring blind devotion or cruel sacrifice. (CDC)
See:  leviathan

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I <=> K