Bad words in Arabic

Hello everyone,

I am new to this group, but I really wanted to learn what kinds of words are usually used to insult someone. Why you might ask? I work as a teacher and a lot of my students are children who speak Arabic. Usually my children do not say bad or insulting words, but with the looks on their faces I sometimes know they say something that is not very nice. I have learned a few phrases that I know are bad, because well. Other children also tell me sometimes if words are bad.

I was wondering what kinds of words are also bad. Most of the student in my class are from Syria, so I know that is a special dialect. Does it make a difference for insulting words?

Thank you to the people who are able to help me.

Sincerely, a clueless teacher who just wants to know.