treachery

[AirbusA321]

What is the difference between these terms? I added my assumptions but I'm not quite sure.
treachery - mainly used in politics and business
treason - mainly used in politics and business
betrayal - mainly used concerning personal affairs
backstabbing - figurative, can be used for different purposes
bewrayment - not so common, maybe outdated?
perfidiousness

 

[GoesStation]

I had to Google "bewrayment". That word does not exist in modern English. I've read extensively and had never seen it before your post.

"Perfidiousness" may show up occasionally in journalistic commentary. "Treachery" could appear in a number of contexts. "Treason" is really only a legal term for the name of a serious crime - a capital crime in the United States - which is clearly defined. It gets tossed around quite a lot in politically tumultuous times.

I don't think I could support any of your characterizations of these words. Words are used in all kinds of contexts, often far beyond their original applications.

 

[AirbusA321]

Which of these adjectives fits best to describe that e.g. a good old friend of yours takes away your girlfriend while you're absent?
backstabbing
treacherous
traitorous