Best thing is to pay the premium ($30 IIRC) to silencerresearch.com and look at the in depth .22 silencer chart. Eye opener. The YHM cans didn't fair well against the competition. Check it out yourself.
The term silencer was coined by Maxim for marketing purposes. That's what the NFA uses as well as muffler (automobile mufflers were actually designed after Maxim's silencer and the first were nothing more than his silencer welded to the tailpipe). The guy from Sound Tech (Mark White?) coined the term suppressor as that is closer to it's actual purpose and end result.
Several manufacturers use silencers, some like YHM use only suppressor, some use the terms, as well as the slang "can", interchangeably. Big deal.