| underpinning(noun, support, action, cause, start) |
| bedrock(noun, support, action, cause, start) |
| essence(noun, organization, action, area, cause) |
| gist(noun, organization, area, strength, substance) |
| motive(noun, cause, start, reason, idea) |
| premise(noun, concept, action, philosophy, cause) |
| rationale(noun, concept, action, understanding, philosophy) |
| support(noun, support, action, reason, substance) |
| assumption(noun, concept, law, action, understanding) |
| bed(noun, organization, support, area, substance) |
| cornerstone(noun, law, idea, base, foundation) |
| presumption(noun, concept, action, understanding, philosophy) |
| rest(noun, support, base, foundation, stand) |
| rudiment(noun, law, action, start, top) |
| seat(noun, support, cause, start, reason) |
| substructure(noun, organization, support, study, area) |
| antecedent(noun, action, cause, reason, object) |
| crux(noun, organization, action, area, quality) |
| element(noun, feature, law, drop, part) |
| infrastructure(noun, organization, support, action, cause) |