The best replacement for noun is verb.

The best alternatives to noun are rated as following:
★★★★★  verb
★★★★  pronoun
★★★  adjective
★★★  proper noun
★  subject
★  adverb
★  common noun
★  noun phrase
★  noun
★  direct object
  abstract noun
  concrete noun
  verb stress
  debbie riddle
  verb pronunciation
  verb words
  proper nouns
  an adjective
  verb grammar

Your alternative for noun is not listed? Suggest!
Speaking about noun, one probably shouldn't forget about preposition.

Other search terms related to noun and their ratings are:
★★★★★ preposition
★★★★★ adjective
★★★ ing
an adjective
noun
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Google Trends

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noun
verb
pronoun