aa vs ana

aa

noun
  • A form of lava flow associated with Hawaiian-type volcanoes, consisting of basaltic rock, usually dark-colored with a jagged and loose, clinkery surface. Compare pahoehoe. 

ana

noun
  • Anorexia (used especially by the pro-ana movement). 

  • A collection of things associated with a person or place, especially a personal collection of anecdotes or conversations at table 

adv
  • Of each; an equal quantity. 

  • In a direction analogous to up, but along the additional axis added by the fourth dimension. 

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