I know it's a proper noun (the name of something). A Google search (adjective?) for the answer was unsuccessful. No one will commit that proper verbs exist.
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Currently, there is no such thing in the English language as a proper verb. A proper noun is the name of a specific person, place, or thing, such as Gerald, New York, and the Titanic. Whilst the word Google has become a verb, it is not a proper verb. That would be a brand new grammatical category.