| significant(adjective, important, essential, prime, main) |
| foremost(adjective, adverb, important, master, essential) |
| basal(adjective, base, basic, key, main) |
| dominant(adjective, essential, prime, vital, necessary) |
| elemental(adjective, base, basic, key, main) |
| first(adjective, important, master, essential, key) |
| head(noun, adjective, important, essential, main) |
| indispensable(adjective, base, basic, key, main) |
| paramount(adjective, important, essential, main, chief) |
| primal(adjective, base, important, essential, basic) |
| supreme(adjective, important, essential, main, chief) |
| considerable(adjective, essential, prime, vital, necessary) |
| constitutional(adjective, essential, prime, vital, necessary) |
| controlling(adjective, important, essential, main, chief) |
| outstanding(adjective, important, essential, main, chief) |
| stellar(adjective, important, essential, main, chief) |
| basic(adjective, essential, prime, main, necessary) |
| fundamental(adjective, essential, prime, main, necessary) |
| initial(adjective, essential, prime, vital, necessary) |
| decisive(adjective, essential, prime, main, necessary) |