I started an almost-daily offering of a grammar, usage or style tip in April, 2009, and last week I tweeted my 500th tip. Here is my archive to date, which also can be found at my business website, http://www.markallenediting.com.
If you want a big gun, ask for a “cannon.” One “n” is for a law or principle, literary works, or a piece of music. The camera is Canon.
Mackinac Island is in the Straits of Mackinac, which link Lakes Huron and Michigan under the Mackinac Bridge. All are pronounced “Mackinaw.”
The coat, blanket and city are all Mackinaw. The word starts with the Ojibwe and comes through French Canadian, hence the pronunciation.