core, nature, substance, spirit, heart, quintessence, soul,, crux, principle, basis, kernel, pith, marrow, being, reality, life, essentiality, fundament, intrinsic nature, sine qua non, lifeblood, mea... [mehr]
core, nature, substance, spirit, heart, quintessence, soul,, crux, principle, basis, kernel, pith, marrow, being, reality, life, essentiality, fundament, intrinsic nature, sine qua non, lifeblood, mea... [mehr]