Thank you for your response.
Ohhh! it’s true! It’s a list I put in my installation because I used to get a lot of spam.
I downloaded from:
https://github.com/splorp/wordpress-comment-blacklist/blob/master/blacklist.txt
So, it’s no a problem for me to remove it. What is strange is that the word that is activating the spam is not in the list…
Thanks again!