The best replacement for chiles is chilies.

The best alternatives to chiles are rated as following:
★★★★★  chilies
★★★★★  jalapenos
★★★★  peppers
★★★  rickards
★  ancho
★  chilis
★  new mexico chiles
★  chipotle peppers
★  hatch chilis
  red chiles
  chiles
  california chiles
  poblano

Your alternative for chiles is not listed? Suggest!
Speaking about chiles, one probably shouldn't forget about adobo sauce.

Other search terms related to chiles and their ratings are:
★★★★★ adobo sauce
You have in mind a companion for chiles and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of chiles in all years. Click on graph for more.
chiles
chilies
jalapenos