| essential(adjective, importance, important, valuable, surface) |
| vital(adjective, importance, valuable, essential, surface) |
| organic(adjective, important, significant, original, basic) |
| substantial(adjective, importance, valuable, main, notable) |
| integral(adjective, importance, essential, surface, main) |
| key(adjective, importance, valuable, essential, main) |
| material(adjective, importance, valuable, main, notable) |
| constituent |
| constitutional(adjective, important, significant, original, essential) |
| fundamental(adjective, important, capital, essential, critical) |
| big-league(adjective, importance, valuable, main, notable) |
| big(adjective, importance, valuable, main, notable) |
| big shot(adjective, importance, valuable, main, notable) |
| bigwig(adjective, importance, valuable, main, notable) |
| challenging(adjective, importance, valuable, main, notable) |
| consequential(adjective, importance, valuable, main, notable) |
| donnish(adjective, importance, valuable, main, notable) |
| earnest(adjective, importance, valuable, main, notable) |
| exciting(adjective, importance, valuable, main, notable) |
| far reaching(adjective, importance, valuable, main, notable) |