In what word class does the word "gouging" belong in this context?

Here is the full sentence:

"The gaping defect was surrounded by multiple and extensive irregular punctate gouging type injuries measuring from 1/8 inch to 3/4 inch and had a depth of penetration of 1/4 inch to 1/2 inch."

Could you help me determine the word classes for the words in the phrase, "multiple irregular punctate gouging type injuries"?

I'm trying to determine the word class of the word gouging in particular.

Is it an adjective? Is it a verb? Is the whole thing a noun phrase?
It does relate to forensic pathology, as well as law.

My argument is that a knife's ability to "gouge out an eye" is not comparable to its ability to create "punctate gouging type injuries," and I believe the word class for "gouging" is different in each context, and that is central to my argument.
 
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