Word replacement

Good day.  Is there an easy way to replace a word with a new word every place it is found through the story?  For example, the headder on all of my slides in the scene is "baton de défénse"  this word appears all throughout the story and I want to replace it with "baton téléscopique" every where it is found through the story.  Is there an easier way to do this rather than going through each individual slide and changing each instance manually (provided I don't over look one).

Thanks for your help

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