-al vs -th

-al

suffix
  • Forming nouns, especially of verbal action. 

  • Forms the names of aldehydes. 

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

-th

suffix
  • Used to form nouns from verbs of action. 

  • Used to form a term denoting the ordinal numeral corresponding to the value, being a natural number, of a mathematical expression. 

  • Used to form the ordinal numeral when the final term of the spelled number is not “first”, “second”, or “third”. 

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