[or aiin]

[MarcoP]

I made a brute-force search for asymmetric word pairs. These are the most asymmetric couples (the two numbers are the occurrences of A.B and the occurrences of B.A). or aiin is indeed the most remarkable case.
I attach a more extensive list sorted by this arbitrary relevance measure: #(A.B)*[(#A.B-#B.A)/(#A.B+#B.A)]

or aiin 52 9 
s aiin 40 4 
chol daiin 35 7 
r aiin 18 0 
ar aiin 24 5 
ol shedy 24 7 
ar al 25 8 
ol chedy 22 6 
chedy qokeey 19 4 
or shedy 10 0 
shedy qokeey 13 2 
s ar 11 1 
sheedy qokeedy 9 0 
okar ar 12 2 
aiin chey 12 2 
shedy qokedy 21 9 
or aiiin 8 0 
al chedy 8 0 
shedy qokeedy 16 6 
qokeey qokedy 9 1 
qokaiin ol 9 1 
dar al 9 1 
aiin okal 9 1