as in vs especially

as in

adv
  • In the sense of. 

  • Used other than figuratively or idiomatically: see as, in. 

especially

adv
  • In a special manner; specially. 

  • Used to place greater emphasis upon someone or something. 

  • Particularly; to a greater extent than is normal. 

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