The nounhood of a word is determined by its function in a sentence.

She has a nounlike ability to remember names.

She nounizes her thoughts into written words.

She nounized the concept and turned it into a successful business.

She enjoys nounizing words in her writing.

She tried to nounize the adjective by adding a suffix.

Her proper nounhood was evident in the way she always capitalized her name.

She spoke nounally during the meeting.

She is nounier than her sister.

She is the nouniest person I know.