| must(noun, situation, need, necessity) |
| must-have(noun, situation, need, necessity) |
| necessary(noun, situation, need, necessity) |
| necessity(noun, situation, need) |
| need(noun, situation, necessity) |
| needful(noun, situation, need, necessity) |
| occurrence(noun, event, case, happening, however) |
| plus(noun, limit, condition) |
| possibility(noun, event, case, happening, however) |
| precondition(noun, limit, condition, situation, need) |
| prerequisite(noun, limit, condition, situation, need) |
| requirement(noun, situation, need, necessity) |
| requisite(noun, situation, need, necessity) |
| restraint(noun, limit, condition) |
| restriction(noun, limit, condition, situation, need) |
| situation(noun, event, case, happening, however) |
| stricture(noun, limit, condition) |
| strings(noun, situation, need, necessity) |
| terms(noun, situation, need, necessity) |
| therefore(adverb, also, more, furthermore) |