decad vs ten

decad

noun
  • A group of ten notes from which the consonant triads may be constructed 

ten

noun
  • A set or group with ten elements. 

  • A card in a given suit with a value of ten. 

  • A perfect specimen, (particularly) a physically attractive person. 

  • An inexact quantity, typically understood to be between 20 and 100. 

  • A denomination of currency, such as a banknote, with a value of ten units. 

  • A high level of intensity. 

  • The act of rowing ten strokes flat out. 

num
  • The number occurring after nine and before eleven, represented in Arabic numerals (base ten) as 10 and in Roman numerals as X. 

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