Hi
Turns out that util-linux is working as described in its manpage. I tried with 
the older implementation (bsdmainutils) too and the same issue persists. So the 
root cause is the default wordlist.
"look" expects the default wordlist to be sorted in a case-insensitive manner 
(which it was earlier) but now it is sorted in the ASCII order.
We can:
- Request the maintainers of wordlist to revert the way they sort the words 
(atleast wamerican)
- Supply our own wordlists to specifically make "look" work, but this will need 
to be in all supported languages and the default wordlist would change based on 
the locale of the user
- run a sort everytime (or better, the first time - but we will have to track 
change in locales) "look" is used in the default way.

Since the first two options are overkill for this, and the last option
can be easily done by the user (sort the exisiting
/usr/share/dict/words, save as another file, set that as the WORDLIST
env) than requiring a change in the util-linux package, I have moved
this bug to "Won't Fix"

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https://bugs.launchpad.net/bugs/1971425

Title:
  The "look" cli dictionary only sees capitalized words

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