| foundation(noun, base, beginning, source, essential) |
| mainstay(noun, support, base, essential, foundation) |
| cornerstone(noun, idea, base, element, foundation) |
| backbone(noun, support, action, base, beginning) |
| basis(noun, law, regulation, action, idea) |
| headstone(noun, base, gravestone) |
| principle(noun, support, action, idea, base) |
| anchor(noun, essential, foundation, kingpin, fulcrum) |
| core(noun, support, action, idea, base) |
| linchpin(noun, idea, essential, foundation, essence) |
| arch |
| essence(noun, support, action, idea, base) |
| fundamental(noun, law, support, regulation, action) |
| gist(noun, importance) |
| ground(noun, foundation, motive, reinforcement) |
| heart(noun, support, action, idea, base) |
| key |
| quoin(noun, block, lump, segment, chunk) |
| support(noun, action, base, beginning, source) |
| groundwork(noun, foundation, reinforcement) |