What is a common noun for North America?

There isn't a single, universally accepted common noun for North America.

You could use some of these options, depending on the context:

* Continent: This is the most straightforward and accurate description.

* Landmass: This is also technically correct but less common in everyday speech.

* Region: This emphasizes the geographic area rather than the specific continent.

* The Americas: This refers to both North and South America, so it's not entirely specific to North America.

It's important to consider the specific situation and choose the term that best fits your needs.