I looked up "pernicious" at http://www.answers.com, and found only the adjective form (which is obvious from the -ous on the end of it).
You could make it a noun by adding the ending -ness.
You can also go to http://www.onelook.com and enter the main part of each word and an asterisk (wild card!) -- and see what comes up.
Let us know what you find.
And remember that there are some pretty standard adjective and noun endings:
Let us know what else you come up with.
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