The best replacement for capsicum is bell pepper.

The best alternatives to capsicum are rated as following:
★★★★★  bell pepper
★★★★  pepper
★★  capsaicin
★★  cayenne
★  cayenne pepper
  ball pepper

Your alternative for capsicum is not listed? Suggest!
Speaking about capsicum, one probably shouldn't forget about paneer.

Other search terms related to capsicum and their ratings are:
★★★★★ paneer
★★ besan
★★ aloo curry
You have in mind a companion for capsicum and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of capsicum in all years. Click on graph for more.
capsicum
bell pepper
pepper