Dungarees are bib overalls, because the top is a bib. So they're a kind of overalls and yeah the most popular/often talked about but I grew up with those being called "bibs" because otherwise "overalls" meant this kind of thing, work clothes to go over your regular clothes.

Boiler suit is a term used in the U.S. too though, I remember it's what the Ghostbusters call what they end up wearing. :)