| nature |
| all-important(adjective, significant, essential, basic, vital) |
| aspect(noun, nature, quality, character, spirit) |
| attribute(noun, nature, quality, character, spirit) |
| attributes(noun, nature, quality, type, kind) |
| backbone(noun, nature, quality, character, spirit) |
| base(noun, quality, character, spirit, significance) |
| basic(noun, adjective, significant, heart, essential) |
| basis(noun, quality, character, spirit, significance) |
| be-all and end-all(noun, expression, idiom, nature, quality) |
| being(noun, nature, quality, type, kind) |
| binding(adjective, significant, essential, basic, vital) |
| bottom(noun, nature, quality, character, spirit) |
| bottom-line(noun, adjective, significant, essential, basic) |
| bottom line(noun, expression, quality, type, kind) |
| burden(noun, quality, character, spirit, significance) |
| caliber(noun, nature, quality, character, spirit) |
| character(noun, nature, quality, type, kind) |
| chief(adjective, significant, essential, basic, vital) |
| chief constituent(noun, expression, nature, quality, character) |