Synonyms of mainspring

1 Syllable

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

2 Syllables

cause, fountain, basis, rootstock, idea, wellhead, standard, linchpin, linchpins, radix, fountains, source, kernel, marrow, center

3 Syllables

measure, radicle, rhizome, origins, radixes, causation, radices, origin, criterion, causations, substance, principle, motive

4 Syllables

causality, provenience, causalities, cornerstone