| natural(adjective, living, biological, vital, live) |
| vital(adjective, natural, basic, important, significant) |
| constitutional(adjective, essential, basic, vital, important) |
| basic(adjective, essential, important, vital, significant) |
| biological(adjective, natural, living, life, vital) |
| inherent(adjective, natural, structural, essential, living) |
| living(adjective, live, natural, vital, biological) |
| fundamental(adjective, basic, important, essential, natural) |
| biotic(adjective, natural, living, biological, technical) |
| animate(adjective, live, natural, living, biological) |
| structural(adjective, basic, natural, vital, fundamental) |
| primary(adjective, essential, basic, vital, important) |
| elemental(adjective, essential, basic, vital, important) |
| essential(adjective, basic, vital, important, significant) |
| live(adjective, natural, living, vital, biological) |
| innate(adjective, natural, living, inherent, nature) |
| integral(adjective, basic, vital, total, important) |
| principal(adjective, basic, vital, important, significant) |
| necessary(adjective, essential, basic, vital, important) |
| prime(adjective, basic, vital, important, significant) |