| necessary(adjective, significant, substantial, valuable) |
| of moment(expression, significant, substantial, valuable) |
| of note(expression, significant, substantial, valuable) |
| of substance(expression, significant, substantial, valuable) |
| ponderous(significant, substantial, valuable, vital) |
| pressing(significant, substantial, valuable, vital) |
| primary(significant, substantial, valuable, vital) |
| principal(adjective, significant, substantial, valuable) |
| relevant(significant, substantial, valuable, vital) |
| salient(significant, substantial, valuable, vital) |
| serious(important, significant, substantial, valuable) |
| significant(adjective, important, substantial, serious) |
| something(significant, substantial, valuable, vital) |
| standout(significant, substantial, valuable, vital) |
| urgent(important, significant, substantial, serious) |
| vital(important, significant, substantial, serious) |
| weighty(significant, substantial, valuable, vital) |
| exceptional(significant, substantial, valuable, vital) |
| heavy(significant, substantial, valuable, vital) |
| substantial(significant, valuable, vital, imperative) |