Metaphor: A figure of speech that makes a comparison between two unrelated things by stating that one thing is another thing, even though this isn't literally true. For example, the phrase "her lips are a blooming rose" obviously doesn't literally mean what it says—it's a metaphor that makes a comparison between the red beauty and promise of a blooming rose with that of the lips of the woman being described.
Simile: A simile, like a metaphor, makes a comparison between two unrelated things. However, instead of stating that one thing is another thing (as in metaphor), a simile states that one thing is like another thing. An example of a simile would be to say "they fought like cats and dogs."
Oxymoron: An oxymoron pairs contradictory words in order to express new or complex meanings. In the phrase "parting is such sweet sorrow" from Romeo and Juliet, "sweet sorrow" is an oxymoron that captures the complex and simultaneous feelings of pain and pleasure associated with passionate love.
Hyperbole: Hyperbole is an intentional exaggeration of the truth, used to emphasize the importance of something or to create a comic effect. An example of a hyperbole is to say that a backpack "weighs a ton." No backpack literally weighs a ton, but to say "my backpack weighs ten pounds" doesn't effectively communicate how burdensome a heavy backpack feels.
Personification: In personification, non-human things are described as having human attributes, as in the sentence, "The rain poured down on the wedding guests, indifferent to their plans." Describing the rain as "indifferent" is an example of personification, because rain can't be "indifferent," nor can it feel any other human emotion.
Idiom: An idiom is a phrase that, through general usage within a particular group or society, has gained a meaning that is different from the literal meaning of the words. The phrase "it's raining cats and dogs" is known to most Americans to mean that it's raining hard, but an English-speaking foreigner in the United States might find the phrase totally confusing.
Onomatopoeia: Onomatopoeia is a figure of speech in which words evoke the actual sound of the thing they refer to or describe. The “boom” of a firework exploding, the “tick tock” of a clock, and the “ding dong” of a doorbell are all examples of onomatopoeia.
Synecdoche: In synecdoche, a part of something is used to refer to its whole. For example, "The captain commands one hundred sails" is a synecdoche that uses "sails" to refer to ships—ships being the thing of which a sail is a part.
Metonymy: Metonymy is a figure of speech in which an object or concept is referred to not by its own name, but instead by the name of something closely associated with it. For example, in "Wall Street prefers lower taxes," the New York City street that was the original home of the New York Stock Exchange stands in for (or is a "metonym" for) the entire American financial industry.
Alliteration: In alliteration, the same sound repeats in a group of words, such as the “b” sound in: “Bob brought the box of bricks to the basement.” Alliteration uses repetition to create a musical effect that helps phrases to stand out from the language around them.
Assonance: The repetition of vowel sounds repeat in nearby words, such as the "ee" sound: "the squeaky wheel gets the grease." Like alliteration, assonance uses repeated sounds to create a musical effect in which words echo one another.