| basic(noun, adjective, body, material, important) |
| inescapable(adjective, cruel, pitiless, unrelenting, inexorable) |
| key(adjective, important, significant, original, essential) |
| binding(adjective, sound, essential, inexorable, required) |
| cardinal(noun, adjective, important, significant, original) |
| certain(adjective, regular, definite, obvious, expected) |
| compelling(adjective, reasonable, sensible, important, serious) |
| exigent(adjective, important, substantial, serious, valuable) |
| ineluctable(adjective, cruel, pitiless, unrelenting, inexorable) |
| involuntary(adjective, required, inevitable) |
| main(adjective, important, significant, original, capital) |
| must(noun, adjective, right, want, need) |
| need(noun, verb, want, essential, certainty) |
| pressing(adjective, important, substantial, serious, essential) |
| principal(adjective, body, material, big, important) |
| requirement(noun, want, need, essential, certainty) |
| significant(adjective, big, important, original, substantial) |
| undeniable(adjective, certain, definite, expected, unquestionable) |
| wanted(adjective, important, capital, essential, vital) |
| chief(adjective, big, important, significant, substantial) |