Difference between Mainstay and Lynchpin

MAINSTAY vs LYNCHPIN: NOUN

A stabilising rope from the top of the mainmast to the bottom of the foremast.
Main support; principal dependence.
The stay extending from the foot of the foremast to the maintop.
2. Chief support; main dependence: as, their mainstay is fishing.
The rope which secures the head of the mainmast of a vessel forward.
Plural All the stays which give support to the main lower mast, maintopmast, and maintopgallantmast.
A strong rope that serves to steady and support the mainmast of a sailing vessel.
A chief support.
A prominent supporter
A central cohesive source of support and stability
The forestay that braces the mainmast

A central cohesive source of stability and security; a person or thing that is critical to a system or organisation.
A pin inserted through holes at the end of an axle, so as to secure a wheel
A central cohesive source of support and stability
Pin inserted through an axletree to hold a wheel on

Thrust, Essential, Mainstream, Fulcrum, Bedrock, Thorn, Hub, Keystone, Cornerstone, Staple, Anchor, Pillar, Lynchpin, Backbone, Linchpin

Centrepiece, Pivot, Axis, Element, Bedrock, Hub, Touchstone, Pillar, Keystone, Cornerstone, Fulcrum, Anchor, Backbone, Mainstay, Linchpin

Thrust, Essential, Mainstream, Fulcrum, Bedrock, Thorn, Hub, Keystone, Cornerstone, Staple, Anchor, Pillar, Lynchpin, Backbone, Linchpin

Centrepiece, Pivot, Axis, Element, Bedrock, Hub, Touchstone, Pillar, Keystone, Cornerstone, Fulcrum, Anchor, Backbone, Mainstay, Linchpin

Mainstay provides business value services to clients worldwide.
Pulse oximetry is the mainstay of respiratory monitoring.
This Hawaiian food mainstay boasts two Oahu locations.
Dried salmon was the mainstay of their diet.
Kylo Ren, and a mainstay of war culture.
Poles are a mainstay in the fishing world.
He was mixing Lion beer with Mainstay brandy.
Inclusive Youth Participation in Politics Mainstay to Achieving Peace Inclusive Youth Participation in Politics Mainstay to Achieving Peace Written by Yolanda Chitsanzara.
Mainstay Suites is a daily or extended See more of Mainstay Suites Extended Stay Hotel Casa Grande on Facebook.
Mainstay Parks Pale, a beer exclusive to Parks on Tap by Mainstay Independent Brewery.

Against Egypt, Golovin again excelled as he roamed between defensive expert and attacking lynchpin.
SA relations under Brazilian leadership, with Brazil as the lynchpin for developing regionalism.
If technical feasibility is to be the lynchpin on which Yahoo!
DSI score, demonstrating that people are the lynchpin of digital sustainability.
Good sanitation is the longer term lynchpin in community health.
Received TAP grant for sidewalk improvements in Lynchpin Industrial Park.
We shall now address the lynchpin issue in this case.
Hughes Property Management is the lynchpin holding our HOA together.
The lynchpin that allows you to digitize every payment.
Human cells are a lynchpin of biomedical research.