REVISED... (Please excuse my poor formatting as I am a new poster with no skill in this arena)

I'll play along. Here is a hastily arranged list of 20 more examples (I'll call them #21 to #40) that have this added criteria that the first and last letters must be the first and last letters of the three letter combination. I'm unsure whether this makes it more or less difficult to derive answers since you have MORE information, but I like the variation.

The list from 41 to 65 is a more carefully constructed list with the added twist that I will give what I think to be the shortest word (correct me if I'm wrong) that fits the new criteria. See if you can come up with a longer word that fits the new criteria.

21. HBC..........41. kpy kelpy
22. DKF..........42. tzy tizzy
23. DZM.........43. sza stanza
24. EFA..........44. hoi houri
25. FPC..........45. hrb herb
26. AYX.........46. usc unrealistic
27. BWF.........47. jek jerk
28. ILH..........48. mqn mannequin
29. KCL..........49. qme quagmire
30. LBH..........50. nlk niblick
31. NPP..........51. hnb hobnob
32. RAB..........52. ifo info
33. UYT..........53. vno vino
34. WTM.........54. mqg misquoting
35. XER..........55. dbf debrief
36. NYD.........56. voc voltaic
37. LKL..........57. ibx ibex
38. ATF..........58. lnx lynx
39. CTB..........59. gzn galvanization
40. OYY..........60. fnp fingertip
.....................61. mbl mislabel
.....................62. hzt haziest
.....................63. rbb rhubarb
.....................64. ebo embryo
.....................65. wro weirdo