It gets stuck on one word (one of the ones you previously entered but despite entering a new one it repeats one you typed in another time. Fundamentally broken. Refund pls.) and things like Sulfur or Plutonium or.. They have no effect. Give it heavy metal and it wont be poisoned.
You should simply integrate it with some sort of AI to account for the possibility of literally anything. AI can account for that and give a appropiate reaction.