| indispensableness |
| necessity(noun, need, essential, requirement, prerequisite) |
| vitalness |
| essentiality(noun, need, essential, requirement, prerequisite) |
| needfulness(need, essential, requirement, prerequisite, inevitability) |
| claim(need, essential, requirement, prerequisite, essentiality) |
| compulsion(noun, need, essential, requirement, prerequisite) |
| urgency(noun, need, essential, requirement, prerequisite) |
| call(need, essential, requirement, prerequisite, essentiality) |
| cause(need, essential, requirement, prerequisite, essentiality) |
| demand(noun, need, essential, requirement, prerequisite) |
| desideratum(need, essential, requirement, prerequisite, inevitability) |
| duress(need, essential, requirement, prerequisite, essentiality) |
| essence(need, essential, requirement, prerequisite, essentiality) |
| essential(need, requirement, prerequisite, inevitability, essentiality) |
| essentialness |
| exaction(need, essential, requirement, prerequisite, essentiality) |
| exigency(noun, need, essential, requirement, prerequisite) |
| fundamental(need, essential, requirement, prerequisite, essentiality) |
| godsend(need, essential, requirement, prerequisite, essentiality) |