“Non-violent communication” is referring to quite a specific communication technique, it doesn’t mean that all other communication styles are ‘violent’.
I'm still confused how there can be violence (behaviour involving physical force intended to hurt, damage, or kill someone or something) in speech, where is the physical force ?
You mean like screaming demands, insults and threats at someone that might scar them if repeated over and over?
I think that could be considered violent but it really depends on metaphors here.
It's physical in the way that the body remembers trauma I suppose. Words might not break your bones but they sure could lead to auto-immune disorders, memory disorders, hormonal imbalance, stomach conditions, blood pressure conditions, thyroid conditions, not to mention mood regulation issues and other issues etc.
If your body is conditioned to be in a tortured/stressed/powerless state it won't understand how to regulate properly later leading to further issues. So you could say it is a physical force here in this way damaging and changing your body forever.
There are a fair amount of things out there on this topic.
I started getting autoimmune disorders in middle school due to stress in my home, unfortunately my family didn't actually realize I was sick then due to stress in my home lol. But that was just how it was and life got considerably worse because the yelling further escalated in other members to eventual violence. This lead to quite a lot of other issues in my early 20's compounding so when people are like it's just words, you don't know much and how fast words can escalate. Words have a lot of power, don't dismiss them too easily. My family always liked to and it sure left damage.