caplet vs capsule

caplet

noun
  • A smooth-coated tablet (pill, as in medicine) shaped like a capsule, used as a tamper-resistant alternative to a capsule, or an easy-to-swallow alternative to regular tablets. 

  • A component of an interest rate cap, a derivative instrument that effectively prevents the interest payments on an otherwise variable-rate loan from exceeding an agreed level (the "cap"). Each "caplet", analysable as a call option, covers one interest accrual period (such as three months); the whole interest rate cap is made up of a series of consecutive caplets. 

capsule

noun
  • A small container containing a dose of medicine. 

  • A membranous envelope. 

  • A tough, fibrous layer surrounding an organ such as the kidney or liver 

  • A detachable part of a rocket or spacecraft (usually in the nose) containing the crew's living space. 

  • A type of simple, dehiscent, dry fruit (seed-case) produced by many species of flowering plants, such as poppy, lily, orchid, willow and cotton. 

  • The covering — formerly lead or tin, now often plastic — over the cork at the top of the wine bottle. 

  • A membrane that surrounds the eyeball 

  • A small cup or shell, often of metal, for a percussion cap, cartridge, etc. 

  • A sporangium, especially in bryophytes. 

  • in a brief, condensed or compact form 

  • A small, shallow evaporating dish, usually of porcelain. 

verb
  • To encapsulate or summarize. 

  • To form (medicine, etc.) into capsules. 

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