The type of figurative language expressed in the sentence "It's a swimming killing machine that makes sharks look like kittens" is metaphor and hyperbole.
What is a metaphor?
Corresponds to an implied comparison by not requiring connecting words in the text, such as a conjunction or comparative conjunctive phrase.
The object of comparison can be presented implicitly and not referenced in the text, as in the case of the expression "swimming killing machine" which can be a comparison to a wild marine animal, such as a whale for example.
Therefore, hyperbole is also present in the sentence by generating an exaggeration for the comparison, generating greater emotion and drama in the sentence.
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