Why do I always stutter with the same word? Any suggestions to avoid it?

Why do I always stutter with the same word? Any suggestions to avoid it? Hey guys. I'm 18 and I'm italian.. and I stutter. My stuttering is caused by my emotionality, so this means that there could be days where I stutter a lot and days where I don't stutter at all. However, I always stutter with one word which in italian is used to do the negative form of every sentence (this word is "non" and can be translated with "not"). Why do I stutter with this word in particular and not another one? One time I've heard that stuttering with specific words doesn't exist, but that's what happens to me.. If you have had my same problem and would like to share some suggestions on how to avoid it, I'd be very grateful to you :)