| base |
| gist(noun, strength, point, substance, idea) |
| substance(noun, issue, material, matter, meaning) |
| song(noun, expression, music, work, piece) |
| motive(noun, point, issue, piece, idea) |
| radical |
| stem |
| tune(noun, expression, work, piece, arrangement) |
| thread |
| treatise(noun, literature, text, feature, study) |
| core(noun, strength, point, substance, idea) |
| affair(noun, point, issue, idea, material) |
| business(noun, point, issue, idea, material) |
| case(noun, point, issue, idea, material) |
| concept(noun, topic) |
| exposition(noun, feature, study, music, change) |
| focus(noun, subject, activity, act, interest) |
| piece(noun, literature, text, feature, music) |
| problem(noun, activity, study, work, point) |
| proposition(noun, point, difficulty, view, issue) |