| intrinsic(adjective, important, significant, essential, basic) |
| introductory(adjective, simple, straightforward, basic, fundamental) |
| item(noun, feature, part, plan, point) |
| kernel(noun, body, substance, short, heart) |
| key(adjective, important, significant, essential, basic) |
| key point(noun, expression, essence, profit, core) |
| last word(noun, expression, essence, profit, core) |
| logic(noun, good, understanding, point, burden) |
| loss(noun, essence, profit, core, income) |
| main idea(noun, expression, body, heart, essence) |
| main point(noun, expression, essence, profit, core) |
| main thing(noun, expression, essence, profit, core) |
| matter(noun, good, understanding, point, burden) |
| meat(noun, good, understanding, body, point) |
| message(noun, good, understanding, point, burden) |
| minor point(noun, expression, feature, part, plan) |
| minutia(noun, feature, part, plan, point) |
| nature of the beast(noun, expression, idiom, good, understanding) |
| net(noun, essence, profit, core, income) |
| nicety(noun, feature, part, plan, point) |