The best replacement for classical guitar is acoustic guitar.

The best alternatives to classical guitar are rated as following:
★★★★★  acoustic guitar
★★★★  acoustic
★★★★  steel string
★★★  flamenco guitar
★★  electric guitar
★★  folk guitar
★  spanish guitar
★  dreadnought
★  jazz guitar
★  steel string guitar
★  guitar
★  steel string acoustic
  fingerstyle
  rock guitar
  flamenco
  dreadnought guitar

Your alternative for classical guitar is not listed? Suggest!
Speaking about classical guitar, one probably shouldn't forget about finger picks.

Other search terms related to classical guitar and their ratings are:
★★★★★ finger picks
You have in mind a companion for classical guitar and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of classical guitar in all years. Click on graph for more.
classical guitar
acoustic guitar
acoustic