introit vs praise

introit

noun
  • An anthem or psalm sung before a Communion service 

  • A prayer, typically part of a psalm or other portion of the Bible, read or sung at the start of Mass while or immediately after the priest ascends to the altar. 

  • A composition of vocal music sung at the opening of a church service. 

praise

noun
  • Worship. 

  • Commendation; favourable representation in words. 

verb
  • To give praise to; to commend, glorify, or worship. 

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