| pilot(adjective, start, new, opening, basic) |
| run(noun, verb, event, fight, struggle) |
| shot(noun, go, work, energy, crack) |
| suit(noun, activity, action, movement, progress) |
| verification(noun, study, check, measure, approval) |
| vexation(noun, trouble, bother, worry, concern) |
| wretchedness(noun, trouble, worry, distress, care) |
| abyss(noun, difficulty, torment, misery, suffering) |
| bad luck(noun, expression, trouble, ruin, defeat) |
| benchmark(noun, rule, standard, experiment) |
| competition(noun, meet, challenge, struggle, match) |
| contretemps(noun, difficulty, disaster, hardship, misfortune) |
| crack(noun, go, energy, informal, struggle) |
| dry run(noun, expression, idiom, study, go) |
| fling(noun, study, go, check, energy) |
| inconvenience(noun, upset, trouble, bother, blow) |
| misadventure(noun, trouble, ruin, defeat, blow) |
| mishap(noun, trouble, ruin, defeat, concern) |
| preliminary(noun, adjective, check, new, approval) |
| probationary(adjective, new, unsettled, indefinite, temporary) |