| vital(adjective, importance, main, extremely significant) |
| constitutive(adjective, importance, main, extremely significant) |
| driving force |
| heart of hearts(noun, expression, idiom, spirit, emotion) |
| midmost(adjective, middle, central) |
| outstanding(adjective, importance, main, extremely significant) |
| purport(noun, good, understanding, strength, point) |
| serious(adjective, importance, main, extremely significant) |
| substantial(adjective, importance, main, extremely significant) |
| theme(noun, strength, point, substance, idea) |
| thrust(noun, good, understanding, strength, point) |
| amount(noun, area, strength, burden, effect) |
| backbone(noun, support, action, quality, character) |
| centrality(noun, center, middle, target, centrality) |
| consequence(noun, effect, significance, meaning, heart) |
| focal(adjective, key, chief, central, foremost) |
| foundation(noun, organization, cause, start, base) |
| halfway(adjective, heart, center, middle, central) |
| import(noun, good, understanding, strength, point) |
| importance(noun, force, sense, significance, meaning) |