core Synonyms

gist meat crux burden essence effect heart and soul nitty-gritty marrow center centre substance pith nub nucleus heart kernel inwardness substructure staple radicle substratum subject-matter springhead spirit substantive ticker sum wick waist vitals virtuality vertebra upshot underlying umbilicus touchstone torus torso testicle tenderloin vital summation spine polyatomic polestar point pivotal pivot penetralia