| introductory(adjective, authentic, first, previous, initial) |
| key(adjective, important, significant, original, essential) |
| major(adjective, important, significant, original, essential) |
| meat-and-potatoes(adjective, important, significant, fresh, original) |
| necessary(adjective, important, significant, original, essential) |
| new |
| paramount(adjective, important, significant, original, essential) |
| primeval(adjective, authentic, first, previous, initial) |
| primordial(adjective, rough, important, significant, original) |
| principal(adjective, important, significant, original, essential) |
| pristine(adjective, simple, basic, authentic, first) |
| radical(adjective, important, significant, original, essential) |
| requisite(adjective, important, significant, original, essential) |
| revolutionary |
| rudimental(adjective, authentic, first, previous, initial) |
| rudimentary(adjective, rough, important, significant, fresh) |
| significant(adjective, important, original, essential, basic) |
| structural(adjective, important, significant, original, basic) |
| substratal(adjective, rough, important, significant, fresh) |
| substrative(adjective, important, significant, original, essential) |