-ful vs -y

-ful

suffix
  • Used to form adjectives from nouns, with the sense of being full of, tending to, or thoroughly possessing the quality expressed by the noun. 

  • Used to form nouns from nouns meaning “as much as can be held by what is denoted by the noun” 

-y

suffix
  • Added to nouns and adjectives to form adjectives meaning “having the quality of”, either “involving the referent” or “analogous to it”. 

  • Added to verbs to form adjectives meaning "inclined to". 

  • Used in the name of some locations which end in -ia in Latin. 

  • Forming abstract nouns denoting a state, condition, or quality. 

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