| call(need, essential, requirement, prerequisite, essentiality) |
| cause(need, essential, requirement, prerequisite, essentiality) |
| claim(need, essential, requirement, prerequisite, essentiality) |
| compulsion(need, essential, requirement, prerequisite, essentiality) |
| demand(need, essential, requirement, prerequisite, essentiality) |
| desideratum(need, essential, requirement, prerequisite, inevitability) |
| duress(need, essential, requirement, prerequisite, essentiality) |
| essence(need, essential, requirement, prerequisite, essentiality) |
| essential(need, requirement, prerequisite, inevitability, essentiality) |
| essentiality(need, essential, requirement, prerequisite) |
| exaction(need, essential, requirement, prerequisite, essentiality) |
| exigency(need, essential, requirement, prerequisite, essentiality) |
| fundamental(need, essential, requirement, prerequisite, essentiality) |
| godsend(need, essential, requirement, prerequisite, essentiality) |
| imperative(need, essential, requirement, prerequisite, essentiality) |
| indispensability(need, essential, requirement, prerequisite, inevitability) |
| inevitability(need, essential, requirement, prerequisite, essentiality) |
| inexorableness(need, essential, requirement, prerequisite, essentiality) |
| life or death(expression, idiom, need, essential, requirement) |
| necessary(need, essential, requirement, prerequisite, inevitability) |