| substance(noun, issue, idea, material, matter) |
| basis(noun, substance, idea, short, meaning) |
| crux(noun, idea, matter, subject, argument) |
| head(noun, point, line, piece, idea) |
| proposition(noun, point, difficulty, line, issue) |
| chapter(noun, group, idea, section) |
| context |
| essence(noun, substance, idea, matter, subject) |
| keynote(noun, point, line, substance, idea) |
| moot point(noun, expression, idiom, idea, matter) |
| motive(noun, point, line, piece, idea) |
| query |
| theorem(noun, idea, matter) |
| thing(noun, business, area, concern, interest) |
| angle |
| area(noun, discipline, subject, theme) |
| concept |
| episode(noun, business, trouble, part, worry) |
| event(noun, business, trouble, worry, concern) |
| field(noun, area, discipline, matter, subject) |