| ABCs(noun, condition, essence, basic, fundamental) |
| basic(noun, condition, essential, essence, fundamental) |
| cause(noun, need, essential, requirement, prerequisite) |
| claim(noun, concern, demand, need, essential) |
| compulsion(noun, concern, demand, need, essential) |
| corporeity |
| demand(noun, concern, need, essential, requirement) |
| desideratum(noun, concern, demand, need, essential) |
| duress(noun, need, essential, requirement, prerequisite) |
| element(noun, concern, condition, demand, need) |
| essence(noun, condition, need, essential, basic) |
| essential(noun, concern, demand, need, basic) |
| essentiality(noun, need, essential, requirement, prerequisite) |
| exaction(noun, concern, demand, need, essential) |
| exigency(noun, concern, demand, need, essential) |
| fire and ice(noun, expression, idiom, condition, essence) |
| fundamental(noun, concern, demand, need, essential) |
| godsend(noun, need, essential, requirement, prerequisite) |
| groundwork |
| heart(noun, condition, basic, fundamental, necessity) |