[jQuery] How to replace one word with another when it's not alone in a cell?

[squint]

I want to simply replace the word "comment" wherever it is in a
particular
table.

Here's my jQuery attempt:

$(document).ready(function(){

$("td:contains('comment')").text("vote");

});

What this does though is replace all of the text in every cell that
has the
word "comment" in it with the word "vote".

I just want to replace the word "comment" in every cell, not all of
the text
in every cell.

Is there a way to do this with jQuery?

I am doing this on a Confluence wiki if that makes any difference.