especially vs howsoever

especially

adv
  • In a special manner; specially. 

  • Used to place greater emphasis upon someone or something. 

  • Particularly; to a greater extent than is normal. 

howsoever

adv
  • To whatever degree or extent. 

  • Regardless of the way in which. 

  • In any manner whatsoever. 

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