Full text searches should be done carefully, I concede. However, it is interesting that Aragorn only uses the term in the relative safety of Minas Tirith after the siege, and after the Witch-King had been reduced to impotence.
I am not sure to what extent uttering the Black Speech draws the attention of the Nazgûl to the speaker. The concept of that seems implied especially in The Fellowship of the Ring; but whether the language would have such power, or the Ringwraiths such fine perception is doubtful.
However, if we dwell on this speculation for a moment, we could have the reason why only the istari dared to draw that attention to them -- they were, as powerful spirits, quite perceivable certainly farther than the Black Speech could have been heard even by the Ringwraiths anyway.
[ January 17, 2003: Message edited by: Sharkû ]
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