a number of vs myriad

a number of

phrase

  • Several. 

  • Several of. 

myriad

adj

  • Great in number; innumerable, multitudinous 

  • Multifaceted, having innumerable elements 

noun

  • A countless number or multitude (of specified things) 

  • Ten thousand; 10,000 

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