| important(adjective, significant, original, essential, critical) |
| primary(adjective, lead, important, head, significant) |
| middle(noun, adjective, adverb, mean, edge) |
| key(adjective, lead, important, head, master) |
| cardinal(noun, adjective, lead, important, head) |
| focal(adjective, main, private, mental, focus) |
| fundamental(adjective, important, significant, original, essential) |
| essential(adjective, important, significant, original, basic) |
| chief(adjective, lead, important, head, significant) |
| median(noun, adjective, mean, edge, main) |
| interior(adjective, government, main, private, mental) |
| halfway(noun, adjective, adverb, mean, complete) |
| main(adjective, lead, important, head, significant) |
| mid(adjective, adverb, mean, edge, main) |
| midway(noun, adjective, adverb, mean, edge) |
| pivotal(adjective, important, critical, vital, main) |
| prime(adjective, lead, important, head, significant) |
| inner(adjective, mean, remote, main, private) |
| internal(adjective, private, mental, middle, inner) |
| principal(adjective, lead, important, head, significant) |