| inherent(adjective, body, material, natural, animate) |
| innate(adjective, body, material, natural, animate) |
| innocent(adjective, pure) |
| integral(material, important, natural, original, basic) |
| intrinsic(adjective, important, significant, original, essential) |
| introductory(adjective, simple, straightforward, basic, fundamental) |
| irreducible(adjective, pure) |
| larval(simple, basic, fundamental, elementary) |
| live(material, natural, basic, living, functional) |
| living(material, natural, basic, functional, nuclear) |
| lowly |
| magistral(adjective, lead, head, master, boss) |
| main and essential(adjective, lead, head, master, boss) |
| master(adjective, lead, head, boss) |
| meanspirited |
| meat-and-potatoes(base, important, last, original, basic) |
| meat and potatoes(expression, adjective, idiom, simple, plain) |
| monolithic(adjective, pure) |
| nascent(adjective, pure) |
| natural(material, basic, living, functional, nuclear) |