Thesaurus / linchpin
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

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The Higgs boson is the linchpin of the Standard Model and the key to why the double simplex arrangement makes sense.
A NEW MAP OF ALL THE PARTICLES AND FORCESNATALIE WOLCHOVER, SAMUEL VELASCO AND LUCY READING-IKKANDAOCTOBER 22, 2020QUANTA MAGAZINE
None of them are experts in epidemiology — the study of how diseases affect populations, a linchpin of particulate matter research.
In fact, building a sizable beauty was a linchpin of Kohl’s “Greatness Agenda” in 2014, with the company hoping beauty would grow from 2% of sales then to 5% in short order, helped by so-called “beauty concierges.”
The demonstration that something like a linchpin of modern metabolism could have emerged under mild, minimally demanding conditions therefore makes a prebiotic origin for the TCA cycle look more feasible, which the metal catalyst experiments did not.
The principal hotspot is the HBO Max streaming service, the linchpin in AT&T’s gigantic strategic shift toward video content.
It’s intriguing how they come up with their decisions in terms of whether or not it’s based off precedent, whether it’s new law, and what aspect of the case was the linchpin of how they decided in terms of the majority opinion.
The drawbolt on a linchpin wagon usually has a head made in the form of the jaws of a wrench.
FARM MECHANICSHERBERT A. SHEARER
That I driv yer honour the last three miles without a linchpin!
If an axle had broken or a linchpin loosened the race would have been lost.
BLAZING THE WAYEMILY INEZ DENNY
Linchpin, linsh′pin, n. a pin used to keep the wheel of a carriage on the axle-tree.

WORDS RELATED TO LINCHPIN

Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.