frontends

/F R AH1 N T EH1 N D Z/
noun
  1. 1

    That part of a hardware or software system that is conceptually closest to the user; the user interface.

Antonyms

Source: https://en.wiktionary.org/wiki/front%20end, https://en.wiktionary.org/wiki/frontend, https://en.wiktionary.org/wiki/frontends