awhile vs shortly

awhile

adv
  • For some time; for a short time. 

  • In the meantime; during an implicit ongoing process. 

shortly

adv
  • In a short or brief time or manner; quickly. 

  • In few words 

  • In or after a short time; soon. 

  • In an irritable ("short") manner. 

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