an vs toward

an

prep
  • In each; to or for each; per. 

article
  • Used before one and words with initial u, eu. 

  • Used before a vowel sound. 

  • Used before all consonants. 

  • Used before /h/ in an unstressed syllable. 

  • Used before /h/ in a stressed syllable. 

noun
  • The first letter of the Georgian alphabet, ა (Mkhedruli), Ⴀ (Asomtavruli) or ⴀ (Nuskhuri). 

num
  • one 

toward

prep
  • In relation to (someone or something). 

  • For the purpose of attaining (an aim). 

  • In the direction of. 

  • Located close to; near (a time or place). 

adj
  • Yielding, pliant; docile; ready or apt to learn; not froward. 

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