| weighty(adjective, importance, valuable, main, notable) |
| core(adjective, importance, main, extremely significant) |
| basic(adjective, important, serious, essential, critical) |
| important(adjective, importance, valuable, essential, main) |
| significant(adjective, importance, valuable, main, notable) |
| basal(adjective, important, original, serious, basic) |
| cardinal(noun, adjective, important, essential, critical) |
| elemental(adjective, important, significant, original, essential) |
| primary(important, original, serious, basic, prime) |
| elementary(adjective, important, significant, original, basic) |
| intrinsic(adjective, important, significant, original, essential) |
| primitive(adjective, important, significant, original, basic) |
| component |
| decisive(important, essential, critical, basic, fundamental) |
| inherent |
| main(adjective, essential) |
| original(important, significant, basic, vital, primary) |
| radical(important, original, basic, vital, primary) |
| underlying(important, original, essential, basic, vital) |
| ab ovo |