| puzzlement(noun, challenge, case, problem, knot) |
| quagmire(noun, challenge, case, problem, knot) |
| quandary(noun, challenge, case, problem, knot) |
| quantity(noun, measure, amount, volume) |
| quantum(noun, measure, quantity, amount, volume) |
| query(noun, examination, disquisition, delving, examen) |
| quest(noun, examination, disquisition, delving, examen) |
| questionary(noun, examination, disquisition, delving, examen) |
| questionnaire(noun, examination, disquisition, delving, examen) |
| quick(noun, question, content, motive, motif) |
| quiz(noun, examination, disquisition, delving, examen) |
| reflection(noun, account, debate, deliberation, advisement) |
| rehearing(noun, examination, disquisition, delving, examen) |
| reinvestigation(noun, examination, disquisition, delving, examen) |
| research(noun, examination, disquisition, delving, examen) |
| responsibility(noun, business, thing, matter, affair) |
| riddle(noun, challenge, case, problem, knot) |
| rumination(noun, account, debate, deliberation, advisement) |
| scrape(noun, business, thing, matter, affair) |
| self-examination(noun, examination, disquisition, delving, examen) |