| No. | Item | Definition |
|---|---|---|
| 1. | agent | person acting on behalf |
| 2. | alternate | a substitute or backup |
| 3. | alternative | another option or choice |
| 4. | amends | something done to compensate |
| 5. | analog | a comparable counterpart |
| 6. | analogue | a comparable counterpart |
| 7. | appointee | person appointed to a role |
| 8. | backup | a reserve used if needed |
| 9. | bench player | reserve player available |
| 10. | bypass | alternative path around something |
| 11. | caretaker | temporary person in charge |
| 12. | changeover | a switch from one to another |
| 13. | choice | something selected instead |
| 14. | clone | an exact duplicate |
| 15. | commutation | substitution of one thing |
| 16. | compensation | something making up for loss |
| 17. | copy | something made in the same form |
| 18. | counterbalance | something balancing another thing |
| 19. | cover | temporary substitute for someone |
| 20. | covering | acting in another’s place |
| 21. | delegate | person appointed to act |
| 22. | deputy | person acting for another |
| 23. | detour | alternate route or course |
| 24. | displacement | being moved from a place |
| 25. | dummy | substitute used as a model |
| 26. | duplicate | an exact copy |
| 27. | edition | a particular issued version |
| 28. | equivalent | something equal in effect |
| 29. | exchange | an act of swapping one thing |
| 30. | fallback | an option if first fails |
| 31. | fill-in | a temporary substitute |
| 32. | filling in | serving temporarily instead |
| 33. | follower | one coming after another |
| 34. | heir | person who succeeds another |
| 35. | indemnity | compensation for damage or loss |
| 36. | inheritor | one who receives after another |
| 37. | interim | temporary replacement arrangement |
| 38. | locum | temporary professional substitute |
| 39. | makeshift | temporary and improvised substitute |
| 40. | match | something closely corresponding |
| 41. | mock-up | full-size substitute model |
| 42. | model | a particular type or version |
| 43. | new part | a fresh component used instead |
| 44. | next in line | person due to succeed |
| 45. | nominee | person chosen to serve |
| 46. | offset | something balancing another |
| 47. | option | a possible choice |
| 48. | other option | another possible choice |
| 49. | overhaul | a thorough renewal or repair |
| 50. | parallel | something similar in role |
| 51. | pinch-hitter | substitute brought in quickly |
| 52. | placeholder | temporary thing holding a place |
| 53. | plan B | backup plan or option |
| 54. | proxy | someone acting for another |
| 55. | quid pro quo | one thing given for another |
| 56. | reassignment | moving to a new role |
| 57. | recasting | changing form or role |
| 58. | recourse | something turned to for help |
| 59. | redeployment | use in a different place |
| 60. | refit | equipping again for use |
| 61. | relief | person replacing another temporarily |
| 62. | reliever | player replacing another |
| 63. | remake | a new version of something |
| 64. | replica | a close copy of something |
| 65. | representative | person acting for others |
| 66. | reserve | something kept for use later |
| 67. | retrofit | adding newer parts later |
| 68. | revision | a changed or updated version |
| 69. | ringer | substitute entered deceptively |
| 70. | second string | backup choice or person |
| 71. | spare | an extra kept for use |
| 72. | stand-in | a temporary person or thing |
| 73. | standby | ready backup for use |
| 74. | stopgap | temporary solution or substitute |
| 75. | sub | short form of substitute |
| 76. | subbie | informal substitute worker |
| 77. | subbing | acting as a substitute |
| 78. | subrogated party | one substituted legally |
| 79. | subrogation | substitution of one for another |
| 80. | substitute | something used instead of another |
| 81. | substitution | the act of putting one instead |
| 82. | succession | coming after in order |
| 83. | successor | one that comes after another |
| 84. | supersession | replacement by something newer |
| 85. | supplanting | taking the place of |
| 86. | surrogate | a person or thing acting instead |
| 87. | switch | a change to something else |
| 88. | symbol | thing representing another thing |
| 89. | taking over | assuming another’s role |
| 90. | temp | temporary replacement worker |
| 91. | token | thing standing for another |
| 92. | trade-off | exchange of one thing |
| 93. | underreplacement | insufficient replacement level |
| 94. | understudy | actor ready to replace another |
| 95. | update | a newer version or change |
| 96. | upgrade | a better newer version |
| 97. | utility player | versatile backup team member |
| 98. | variant | a slightly different form |
| 99. | version | a particular form of something |
| 100. | workaround | alternative method or fix |