-ory vs -y

-ory

suffix
  • of or pertaining to, serving for; adjective suffix appended to various words, often nouns but also verbs, to make an adjective form. Often added to words of Latin origin, but used with other words also 

  • that which pertains to, or serves for; noun suffix appended to various words 

-y

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

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

  • 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 -ory and -y occurred in a corpus of books? (source: Google Ngram Viewer )