Search For a Specific Word

Edit menu : Find…

You want to search for a word, and optionally by matching case.

Then you enter a space, the word to find, and another space, or possibly even just the word to find, though it may find the word as substring of another word if you do not use white-space around it as I have done:

And find the word:

It will find every occurrence of the sought word in the Pages document as there is no means to restrict it to the first occurrence only.