Having researched avoidant, passive aggressive abuse for over 15 years, I would like to say that while bullying can incorporate different forms of abuse, it is unnecessarily confusing to separately coin a term such as 'bullying' or 'harassment' as a separate, specific phenomenon; the image the word bullying conjures up is not so serious childhood playground scraps. Harassment sounds like someone getting bugged at work. They are weak terms which are not accurately descriptive
I prefer the universal term 'abuse'. In addressing its nature and seriousness, the term 'abuse' is much more appropriate. And then we can look into subtypes of abuse - physical, mental/emotional, social etc. and then we have direct and indirect i.e., passive-aggressive forms of abuse.
My arena of research is passive aggressive avoidant abuse.