あ
 
べ
 
こ
 
べ

takes genitive case の, adjectival noun or quasi-adjective, noun

Onomatopoeic or mimetic word.
  1. contrary, opposite, inverse, reverse, back-to-front.

Variations

Pronunciation Kanji Kana Is Common
 
あ
 
べ
 
こ
 
べ
あべこべ ✔