Hi, what you report is a very, very common phenomenon for stutterers. We each have our own list of problematic words; each stutterer seems to have his or her own. So there is nothing "wrong" about your experience. If you want to read further, I would suggest the Bible of stuttering research, "A handbook on stuttering 7th Edition" by Bloodstein et al. It is expensive but your library might have it. On an unrelated note, there is an interesting paper by Prof. Eric Jackson (NYU), “Adults who stutter do not stutter during private speech”, Journal of Fluency Disorders 70(2021) p. 105878.  In his study, he convinced people who stutter that their speech would not be heard. Under those conditions, all of his 24 subjects were completely fluent.    So my question to you is:  if you can find a place where you really know that you are completely alone, if you then take out a book and start reading aloud, are you fluent?    Irrespective of what your answer is, best of luck to you going forward!