| principal(adjective, serious, basic, prime, major) |
| chief(adjective, important, significant, prime, main) |
| primary(adjective, major, most important) |
| main(adjective, important, significant, serious, prime) |
| paramount(adjective, important, significant, serious, prime) |
| predominant(adjective, important, significant, main, major) |
| prime(adjective, important, significant, serious, main) |
| pivotal(adjective, feature, state, characteristic, important) |
| preponderant(adjective, supreme, dominant, utmost, predominant) |
| dominant(adjective, important, significant, main, major) |
| leading(adjective, feature, state, characteristic, important) |
| cardinal(noun, adjective, important, significant, serious) |
| capital(adjective, most important) |
| central(adjective, serious, basic, prime, main) |
| iconic(adjective, feature, state, characteristic, most important) |
| overwhelming(adjective, strong, intense, uncontrollable) |
| predominate(verb, adjective) |
| determining |
| essential(adjective, feature, state, characteristic, most important) |
| foremost |