| fundamental(noun, adjective, characteristic, drop, part) |
| essential(noun, adjective, characteristic, drop, part) |
| primary(adjective, body, simple, plain, base) |
| elementary(adjective, characteristic, clear, light, start) |
| simple(adjective, clear, hard, light, smooth) |
| organic(adjective, rough, important, coarse, significant) |
| elemental(adjective, body, simple, plain, material) |
| principal(adjective, body, material, important, significant) |
| underlying(adjective, simple, plain, base, important) |
| first(adjective, order, important, significant, opening) |
| main(adjective, top, important, significant, essential) |
| prime(adjective, body, material, pure, important) |
| vital(adjective, body, material, important, significant) |
| necessary(noun, adjective, body, material, important) |
| intrinsic(adjective, characteristic, important, significant, natural) |
| original(adjective, characteristic, body, simple, plain) |
| key(adjective, property, important, head, significant) |
| cardinal(noun, adjective, property, important, head) |
| inherent(adjective, material, natural, essential, absolute) |
| rudimentary(adjective, hard, start, simple, plain) |