There are four or five words; the exact order is different for every player. If you don't remember the order of the words, I believe you can go ask again.
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A quest walkthrough for Demon Slayer can be found here: www.runescape.wikia.com/wiki/Demon Slayer
If this is part of the Demon Slayer quest, then the link below should direct you to your answer.
You have to do the demon slayer quest and near the end a person gives it to you to defeat the demon with it for silverlight. to get the blurite sword you have to do the knights sword. And you have to defeat the demon with the silverlight...
look on runehq
By doing Demon slayer quest