This is impossible for a language

[oshfdk]

But the challenge is to find a suffix that may occur in hundreds of words in the same book, and is by itself a word that is more common than all of them.

All the best, --stolfi

I agree with this.

What's wrong with "in" in English. It's a very frequent word by itself and there are hundred of English words that end with "-in", but I think all of them are not as frequent as "in". bin, tin, sin, spin, grin, chain, begin...