| fundamental(noun, support, action, base, beginning) |
| hard fact(noun, expression, support, action, base) |
| heart(noun, support, action, base, beginning) |
| infrastructure(noun, support, action, base, beginning) |
| justification(noun, support, action, base, beginning) |
| keynote(noun, support, action, base, beginning) |
| keystone(noun, support, action, base, beginning) |
| law(noun, support, action, base, beginning) |
| nexus(noun, support, action, base, beginning) |
| nucleus(noun, support, action, base, beginning) |
| postulate(noun, support, action, base, beginning) |
| premise(noun, support, action, base, beginning) |
| presumption(noun, support, action, base, beginning) |
| presupposition(noun, support, action, base, beginning) |
| principal element(noun, expression, support, action, base) |
| principle(noun, support, action, base, beginning) |
| proof(noun, support, action, base, beginning) |
| reason(noun, support, action, base, beginning) |
| root(noun, support, action, base, beginning) |
| rudiment(noun, support, action, base, beginning) |