a good few vs several

a good few

det

  • A number of, more than a bare few. 

several

det

  • Consisting of a number more than two but not very many. 

noun

  • Each particular taken singly; an item; a detail; an individual. 

adj

  • A number of different; various. 

  • Separable, capable of being treated separately. 

adv

  • By itself; severally. 

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