"The correct term is 'suppressor.'"

Well, yes, that's what they do ("suppress", not "silence"). However, Maxim himself called his invention a "silencer", and that's the term used in federal law.

Personally, I call it a "suppressor". The only thing that bothers me about the term "silencer" is that the ignorant will interpret it to mean that Hollywood's "pffft pffft" sounds are realistic.