dozens of vs occasional

dozens of

occasional

noun

  • A person who does something only occasionally. 

adj

  • Created for a specific occasion. 

  • Acting in the indicated role from time to time. 

  • Occurring or appearing irregularly from time to time, but not often. 

  • Intended for use as the occasion requires. 

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