Synonyms of linchpin

1 Syllable

nub, heart, spring, pith, core, crux, root, gist

2 Syllables

mainspring, basis, idea, mainstay, standard, source, kernel, marrow, center

3 Syllables

sustainer, measure, maintainers, upholder, criterion, upholders, maintainer, substance, principle, motive

4 Syllables

cornerstone