Mass vs octet

Mass

noun
  • A musical composition set to portions of the Mass. 

  • The principal liturgical service of the Church, encompassing both a scripture service (Liturgy of the Word) and a eucharistic service (Liturgy of the Eucharist), which includes the consecration and oblation (offering) of the host and wine. 

  • A similar ceremony offered by a number of Christian churches. 

octet

noun
  • A composition for such a group of musicians. 

  • A group or set of eight of something. 

  • A group of eight musicians performing together. 

  • A byte of eight bits. Abbreviation: o 

  • A group of three bits, representing any of eight possible values. 

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