nounally

/ˈnaʊnəli/
adverb
  1. In a way that relates to or functions as a noun in grammar.
    • The teacher explained how adjectives can sometimes be used nounally.
    • The word 'run' can be used nounally, as in 'a run in the park.'
    • In the sentence, the gerund is acting nounally as the subject.