-ing vs -ity

-ing

suffix
  • Forming nouns having a specified quality, characteristic, or nature; of the kind of 

  • As true nouns. 

  • As gerunds. 

  • Forming derivative nouns (originally masculine), with the sense ‘son of, belonging to’, as in placenames, patronymics or diminutives; -ite. 

  • Used to form present participles of verbs. 

  • Used to form nouns denoting materials or systems of objects which are used or employed in an action, or considered collectively. 

-ity

suffix
  • Used to form a noun from an adjective; especially, to form the noun referring to the state, property, or quality of conforming to the adjective's description. 

  • Used to form other nouns, especially abstract nouns. 

How often have the words -ing and -ity occurred in a corpus of books? (source: Google Ngram Viewer )