cranny vs ostium

cranny

noun
  • A small, narrow opening, fissure, crevice, or chink, as in a wall, or other substance. 

  • A tool for forming the necks of bottles, etc. 

verb
  • To break into, or become full of, crannies. 

  • To haunt or enter by crannies. 

ostium

noun
  • A small opening or orifice, as in a body organ or passage. 

  • Any of the small openings or pores in a sponge. 

  • The mouth of a river. 

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