en.wikipedia.org/wiki/List_of_mountain_types#Volcanic_mountains

Here “Volcanic field” is listed under “Volcanic mountains,” which implies that a volcanic field is itself a type of mountain. Authoritative U.S. Geological Survey sources describe a volcanic field differently.

USGS defines a volcanic field as a geographical area with a high concentration of volcanic vents that may span hundreds or even thousands of square miles. Another USGS page says the Boring Volcanic Field “consists of more than 80 small volcanic vents and associated lava flows” dispersed across a metropolitan area.

That means a volcanic field is a region containing multiple volcanic centers, not a single mountain form like a cinder cone, shield volcano, or stratovolcano. So classifying “Volcanic field” as a kind of volcanic mountain is incorrect.