And if you don't mind the (second) argument getting printed, another 3 chars less:
perl -nlE'sub w{[sort/./g]}$w||=w$_=pop;$w~~w&&say' ./dict.txt acert

This one is wrong (only) if the first line of 'dict.txt' contains a valid word (different from arg2).

example:

$ cat dict.txt 
one
neo
noe
bad
$ perl -nlE'sub w{[sort/./g]}$w||=w$_=pop;$w~~w&&say' ./dict.txt oen
oen
neo
noe

[download]

First word is missing. Anyway, this is a very beautiful version: ++

UPDATE: with an extra newline

perl -E'@a=sort pop=~/./g;say grep@a~~[sort/./g],<>' ./dict.txt acert

UPDATE2: one char useless

perl -E'@a=sort pop=~/./g;say grep@a~~[sort//g],<>' ./dict.txt acert

In reply to Re^4: Perl Golf idea by brx
in thread Perl Golf idea by sweepy838

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