What figurative speech is used here?

The correct answer is Apostrophe.
“Death! Where is thy sting? O Grave! Where is thy victory?” has apostrophe as the figure of speech. Figurative speech or language is when a word or sentence has a difference apart from its literal meaning. There are Simile, personification, metaphor, pun, apostrophe, onomatopoeia, allusion, hyperbole, idiom, alliteration, and irony.

Apostrophe, as a figure of speech, refers to sudden exclamatory pieces of dialogue addressed to something or someone especially absent and cannot respond.

This is no personification; personification refers to a literary device in which an inanimate object or idea is qualified or given human qualities. Example: “The Sun smiles at us.”

Figurative speech is often used in literature. You can find them in poetry mostly and in some short stories. They are used in order to compared nouns or actions and it makes it more specific. Some of the main types of figurative language or speech include similes, personification, hyperbole and metaphors. A simile is a comparison between two unlike things using like or as. A metaphor is a comparison between two unlike things not using like or as. Personification is giving non-human things human characteristics.

A hyperbole is an exaggeration of the truth. In the quote, there are actually two types of figurative language because sometimes a metaphor can be personification because the two things beings compared could be where one thing is a human thing and the other is not human.