I have problem with words starting with "K", it's new for me and I have it since I have went to university this year. but I have found that if I think stuttering is ok and courage myself to say it, it's going to be better. There's a book called "Easy Stuttering - Avoidance-Reduction Therapy" try to read it. It's very useful written by Joseph Sheehan's wife. Joseph Sheehan is one of the most successful therapist in his time, and this book based on his approach. It's help you accept your stuttering and then you will be ok. Link if the book: https://www.scribd.com/doc/23283047/Easy-Stuttering-Avoidance-Reduction-Therapy I think you can read it for free with scribd.