squadron vs tranche

squadron

verb
  • To divide up into squadrons. 

noun
  • A tactical air force unit; consists of at least two flights; multiple squadrons make up a group or wing (depending on particular air force). 

  • A spaceforce unit; multiple squadrons make up an operations delta or a support garrison. 

  • A body of infantrymen made up of several platoons, averaging from eighty to one hundred and fifty men, and led by a captain or a major. 

  • A detachment of vessels employed on any particular service or station, under the command of the senior officer 

  • A body of cavalry comprising two companies or troops, averaging from one hundred and twenty to two hundred soldiers. 

tranche

verb
  • To divide into tranches. 

noun
  • A distinct subdivision of a single policyholder's benefits, typically relating to separate premium increments. 

  • One of a set of classes or risk maturities that compose a multiple-class security, such as a CMO or REMIC; a class of bonds. Collateralized mortgage obligations are structured with several tranches of bonds that have various maturities. 

  • A pension scheme's or scheme member's benefits relating to distinct accrual periods with different rules. 

  • A slice, section or portion. 

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