abusive language, bad language, foul language and dirty words?

1. What are differences between abusive language, bad language, foul language and dirty words?

2. What sort of verbal language we call to express one's speaking of sexual harrassment? Shall I call it dirty words?

Thank you.

One can be abusive and harrassing without using any foul language. "Bad" or "dirty" or "foul" language refer to the use of words that are considered by society to be unfit for public use.

I can abuse someone by threatening to do them bodily harm. I need not throw in any dirty words while doing so.