There are some English words that can be partitioned into two strings of letters, say A & B (each part should have more than one letter) in a way that both AB and BA are valid words.
Examples:
Inch>>chin; mode>>demo; upset>>setup & outlook>>lookout. Let’s call them ABBA words.

Compile a list of all 4-letter ABBA pairs of words.
What is the longest ABBA word you have found?
Provide at least one example in another language.

Remarks: all words, including proper names, slang, plurals etc are accepted as long as they can be found in respectable dictionaries. Esoteric words should have proper explanation

oversleep, sleepover

Posted by Math Man on 2021-12-08 13:43:36