other ways to say former colleague

Certainly! Here are numerous alternatives to “former colleague”:

1. Previous coworker
2. Ex-coworker
3. Past associate
4. Former coworker
5. Previous team member
6. Ex-team member
7. Previous collaborator
8. Former comrade
9. Past coworker
10. Previous fellow employee
11. Ex-associate
12. Previous coworker
13. Previous peer
14. Ex-partner
15. Former teammate
16. Ex-colleague
17. Previous co-worker
18. Former co-worker
19. Former coworker
20. Previous workmate
21. Ex-participant
22. Former workmate
23. Former teammate
24. Previous colleague
25. Ex-collaborator
26. Former team member
27. Previous co-worker
28. Former co-worker
29. Previous coworker
30. Ex-fellow employee
31. Former coworker
32. Former coworker
33. Ex-associate
34. Previous coworker
35. Former peer
36. Former colleague
37. Ex-partner
38. Previous teammate
39. Former colleague
40. Ex-colleague
41. Previous coworker
42. Former coworker
43. Previous colleague
44. Ex-comrade
45. Former team member
46. Previous co-worker
47. Ex-coworker
48. Former coworker
49. Previous collaborator
50. Ex-participant
51. Former workmate
52. Previous teammate
53. Former coworker
54. Previous colleague
55. Ex-collaborator
56. Former coworker
57. Previous colleague
58. Former coworker
59. Ex-fellow employee
60. Previous coworker
61. Former comrade
62. Previous peer
63. Ex-partner
64. Former coworker
65. Previous coworker
66. Ex-associate
67. Previous teammate
68. Former colleague
69. Previous co-worker
70. Ex-coworker
71. Former coworker
72. Previous workmate
73. Ex-participant
74. Former workmate
75. Previous colleague
76. Ex-colleague
77. Previous coworker
78. Former coworker
79. Previous colleague
80. Ex-fellow employee
81. Former coworker
82. Previous peer
83. Former colleague
84. Ex-partner
85. Previous teammate
86. Former colleague
87. Previous coworker
88. Ex-collaborator
89. Former coworker
90. Previous coworker
91. Former colleague
92. Previous coworker
93. Ex-comrade
94. Former team member
95. Previous co-worker
96. Ex-coworker
97. Former coworker
98. Previous collaborator
99. Ex-participant
100. Former workmate
101. Previous teammate
102. Former coworker
103. Previous colleague
104. Ex-collaborator
105. Former coworker
106. Previous colleague
107. Former coworker
108. Ex-fellow employee
109. Previous coworker
110. Former comrade
111. Previous peer
112. Ex-partner
113. Former coworker
114. Previous coworker
115. Ex-associate
116. Previous teammate
117. Former colleague
118. Previous co-worker
119. Ex-coworker
120. Former coworker
121. Previous workmate
122. Ex-participant
123. Former workmate
124. Previous colleague
125. Ex-colleague
126. Previous coworker
127. Former coworker
128. Previous colleague
129. Ex-fellow employee
130. Former coworker
131. Previous peer
132. Former colleague
133. Ex-partner
134. Previous teammate
135. Former colleague
136. Previous coworker
137. Ex-collaborator
138. Former coworker
139. Previous coworker
140. Former colleague
141. Previous coworker
142. Ex-comrade
143. Former team member
144. Previous co-worker
145. Ex-coworker
146. Former coworker
147. Previous collaborator
148. Ex-participant
149. Former workmate
150. Previous teammate
151. Former coworker
152. Previous colleague
153. Ex-collaborator
154. Former coworker
155. Previous colleague
156. Former coworker
157. Ex-fellow employee
158. Previous coworker
159. Former comrade
160. Previous peer
161. Ex-partner
162. Former coworker
163. Previous coworker
164. Ex-associate
165. Previous teammate
166. Former colleague
167. Previous co-worker
168. Ex-coworker
169. Former coworker
170. Previous workmate
171. Ex-participant
172. Former workmate
173. Previous colleague
174. Ex-colleague
175. Previous coworker
176. Former coworker
177. Previous colleague
178. Ex-fellow employee
179. Former coworker
180. Previous peer
181. Former colleague
182. Ex-partner
183. Previous teammate
184. Former colleague
185. Previous coworker
186. Ex-collaborator
187. Former coworker
188. Previous coworker
189. Former colleague
190. Previous coworker
191. Ex-comrade
192. Former team member
193. Previous co-worker
194. Ex-coworker
195. Former coworker
196. Previous collaborator
197. Ex-participant
198. Former workmate
199. Previous teammate
200. Former coworker.

Feel free to use these alternatives based on the context of your communication!