apheresis vs removal

apheresis

noun
  • The removal of blood from a patient, and the removal of certain components (such as platelets) from that blood, followed by the transfusion of the filtered blood back to the donor (patient). 

  • Elision, suppression, or complete loss of a letter or sound (syllable) from the beginning of a word, such as the development of special from especial; procope. 

removal

noun
  • The process of removing, or the fact of being removed. 

  • The relocation of a business etc. 

  • Murder. 

  • An evening funeral ritual in which the coffin holding the deceased is brought, usually from a funeral home, to the church where the funeral mass will be celebrated the following day. Prayers are said before and after the journey, after which mourners are typically received at the home of the deceased. 

  • The dismissal of someone from office. 

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