| snag(noun, trouble, difficulty, pain, struggle) |
| stumper(difficulty, question, secret, puzzle, knot) |
| subject(noun, strength, idea, effect, matter) |
| teaser(difficulty, question, secret, puzzle, knot) |
| tenor(noun, organization, area, strength, material) |
| topic(noun, idea, matter, subject, argument) |
| tough nut to crack(expression, idiom, question, secret, puzzle) |
| upshot(noun, effect, meaning, heart, essence) |
| why(difficulty, question, secret, puzzle, knot) |
| abstruseness(difficulty, question, secret, puzzle, obscurity) |
| abutment(noun, join, point, link, junction) |
| action(noun, support, base, beginning, source) |
| adversity(noun, trouble, difficulty, burden, pain) |
| affliction(noun, difficulty, burden, suffering, something) |
| amount(noun, area, body, strength, effect) |
| ankh |
| antecedent(noun, support, action, base, beginning) |
| arch(adjective, lead, head, master, boss) |
| arduousness(noun, trouble, difficulty, pain, struggle) |
| articulation(noun, join, point, link, joint) |