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Linchpin vs Fulcrum - What's the difference?

linchpin | fulcrum |

As a noun linchpin

is a pin inserted through holes at the end of an axle, so as to secure a wheel.

As a proper noun fulcrum is

(military) nato code name for the soviet mig-29 aircraft.

linchpin

English

Alternative forms

* lynchpin

Noun

(en noun)
  • a pin inserted through holes at the end of an axle, so as to secure a wheel
  • (figuratively) a central cohesive source of stability and security; a person or thing that is critical to a system or organisation.

    • fulcrum

    English

    (wikipedia fulcrum)

    Noun

    (en-noun)
  • (mechanics) The support about which a lever pivots.
  • * It is possible to flick food across the table using your fork as a lever and your finger as a fulcrum .
  • * 2010 , , '' Bad Machinery
    • MILDRED: Archimedes said give me a lever long enough and a fulcrum on which to place it and I will move the world.
    CHARLOTTE: Yeah she said that twaddle eight or nine times.
  • *{{quote-magazine, date=2012-03
    • , author=(Henry Petroski) , title=Opening Doors , volume=100, issue=2, page=112-3 , magazine= citation , passage=A doorknob of whatever roundish shape is effectively a continuum of levers, with the axis of the latching mechanism—known as the spindle—being the fulcrum about which the turning takes place.}}