| main(adjective, base, important, essential, basic) |
| necessary(adjective, base, basic, prime) |
| primary(adjective, base, important, essential, basic) |
| principal(adjective, base, important, essential, basic) |
| central(adjective, base, important, essential, basic) |
| vital(adjective, base, important, essential, basic) |
| chief(adjective, base, basic, prime) |
| capital(adjective, base, important, essential, basic) |
| underlying(adjective, base, essential, basic, prime) |
| essential(adjective, base, basic, prime) |
| foremost(adjective, adverb, important, master, essential) |
| basal(adjective, base, basic, main) |
| elemental(adjective, base, basic, main) |
| first(adjective, important, master, essential) |
| indispensable(adjective, base, basic, main) |
| primal(adjective, base, important, essential, basic) |
| inherent(adjective, base, basic, main) |
| intrinsic(adjective, base, basic, main) |
| pivotal(adjective, base, basic, main) |
| primordial(adjective, base, basic, main) |