| requisite(noun, adjective, condition, important, want) |
| essential(noun, adjective, form, fix, pass) |
| requirement(noun, form, fix, pass, position) |
| imperative(noun, adjective, form, fix, pass) |
| necessary(noun, adjective, important, want, need) |
| proviso(noun, adjective, form, fix, pass) |
| condition(noun, position, shape, situation, essential) |
| necessity(noun, condition, want, need, essential) |
| required(adjective, important, significant, essential, critical) |
| sine qua non(noun, expression, idiom, condition, need) |
| demand(noun, condition, want, need, essential) |
| stipulation(noun, form, fix, pass, position) |
| indispensable(adjective, important, significant, essential, critical) |
| must(noun, adjective, condition, want, need) |
| precondition(noun, condition, need, essential, certainty) |
| need(noun, condition, want, essential, certainty) |
| qualification(noun, condition, essential, theory, requirement) |
| mandatory(adjective, set, significant, essential, basic) |
| obligation(noun, condition, want, need, essential) |
| obligatory(adjective, significant, essential, basic, vital) |