| Rating | Solver | Clue |
|---|---|---|
| AXIOM | Fundamental truth | |
| PRINCIPLE | Fundamental truth | |
| FUNDAMENTAL | ...r the foundation. Hence: Essential, as an element, principle, or law; important; original; elementary; as, a fundamental truth; a fundamental ... | |
| HERESY | ...ion of, or erroneous belief in regard to, some fundamental religious doctrine or truth; heterodoxy. ... |