If each word is a sprite, the make a global variable called something like turn. On each sprite put if turn equals (and then a different number on each sprite) show. If you want them to do something after they have appeared put it in a repeat until turn = (whichver number you used before) and then what you want them to do. On one sprite (or the background) put:
forever
wait 1 secs
set turn to pick random the lowest number you used to the highest number you used.
I hope this is helpful
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