core Synonyms - page 6

major mainstay mainspring maine main locus lodestar medullary mesial metacenter nuclear nubbin nodal nexus necessary navel nave nature midway midst midships midriff midland middlemost mid mezzo linchpin lifeblood knower indispensable incenter incarnation inbeing our hypostasis hypodermic hypocaust hotbed heft heartwood hearted headquarters half-and-half haecceity gravamen indoors inherent inhesion kneeler keystone