Uh, no. That is not the case.
There is no prohibition whatsoever against registering trademarks that are comprised of "common english words(s)"...after all, just consider marks like APPLE, SATURN, etc.
Rather, the issue is whether the words clearly describe an inherent character or quality of the goods or services.
Your misunderstanding is not unusual, though; indeed, it is why many businesses fail to properly protect their marks.
And here is the registration information, by the way...
CANADIAN TRADE-MARK DATA
APPLICATION NUMBER: 0867305