Metaphor:A figure of speech that directly compares two unrelated things by stating one thing is another. (e.g., "Her smile is a ray of sunshine.")
Analogy: An extended comparison between two different things to highlight their similarities in order to explain something complex or unfamiliar.
Alliteration:The repetition of initial consonant sounds in neighboring words or syllables for emphasis or musical effect. (e.g., "Peter Piper picked a peck of pickled peppers.")