| paradox(noun, trouble, challenge, question, puzzle) |
| dilemma(noun, trouble, challenge, question, puzzle) |
| mystification(noun, trouble, challenge, question, secret) |
| pervade(verb, fill, overrun, pierce, puncture) |
| strainer(noun, sieve) |
| brainteaser(noun, difficulty, challenge, question, secret) |
| filter(noun, verb, separate, drain, select) |
| sift(verb, separate, remove, arrange, organize) |
| anagram(noun, secret, dilemma, paradox, enigma) |
| bewilderment(noun, puzzle) |
| colander(noun, verb, separate, opening, drain) |
| charade(noun, difficulty, question, secret, puzzle) |
| drill(verb, open, draw, use, opening) |
| honeycomb(noun, verb, opening, permeate, perforate) |
| prick(verb, opening, sink, punch, penetrate) |
| punch(verb, opening, sink, penetrate, stab) |
| rebus(noun, difficulty, question, secret, puzzle) |
| whodunit(noun, difficulty, question, secret, puzzle) |
| why(noun, trouble, challenge, question, secret) |
| arcanum(noun, mystery) |