The word cataract appears in the following sentences from Moby-Dick:
Chapter 1 > Paragraph 6 > Sentence 8:
Were Niagara but a cataract of sand, would you travel your thousand miles to see it?
Chapter 48 > Paragraph 52 > Sentence 1:
Floating on the waves we saw the abandoned boat, as for one instant it tossed and gaped beneath the ship's bows like a chip at the base of a cataract; and then the vast hull rolled over it, and it was seen no more till it came up weltering astern.
Concordance for the word cataract from Moby-Dick.