heart

bigheartedness, charity, commiseration, compassion, feeling, good-heartedness, humanity, kindheartedness, kindliness, kindness, largeheartedness, mercy, pity, ruth, softheartedness, sympathy, warmheartedness

axis, base, capital, center, central, core, cynosure, epicenter, eye, focus, ground zero, hub, locus, mecca, navel, nerve center, nucleus, seat

bravery, courage, courageousness, daring, daringness, dauntlessness, doughtiness, fearlessness, gallantry, greatheartedness, guts, gutsiness, hardihood, heroism, intestinal fortitude, intrepidity, intrepidness, moxie, nerve, prowess, stoutness, valor, virtue

bottom line, bull's-eye, centerpiece, core, crux, essence, gist, kernel, keynote, meat, meat and potatoes, net, nub, nubbin, nucleus, pith, pivot, point, root, sum

belly, blood, bone(s), bosom, breast, core, gut, heartstrings, inner space, inside, quick, soul