| greatest(adjective, tough, superior, heavy, important) |
| intrinsic(adjective, important, significant, original, essential) |
| primitive(adjective, important, head, significant, beginning) |
| prominent(adjective, outstanding, head, essential, prime) |
| coal-and-ice(important, essential, critical, basic, fundamental) |
| life-or-death(important, essential, critical, basic, fundamental) |
| name(important, essential, critical, basic, fundamental) |
| name-of-the-game(important, essential, critical, basic, fundamental) |
| nitty-gritty(adjective, important, original, essential, critical) |
| nub(adjective, original, basic, absolute, fundamental) |
| quintessential(adjective, significant, essential, basic, vital) |
| substratal(adjective, important, significant, original, essential) |
| underlined(important, essential, critical, basic, fundamental) |
| particular(chief, foremost) |