similes and metaphor

A simile is a figure of speech in which the subject is compared to another subject.

As good as gold —Charles Dickens
A mouth drawn in like a miser's purse —Émile Zola
A woman without a man is like a fish without a bicycle; Irina Dunn, 1970
Happy as pigs in mud — David Eddings
Woo the moon like the tide —Vladimir Mayakovsky

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A metaphor (from the Greek: metapherin rhetorical trope defined as a direct comparison between two or more seemingly unrelated subjects.

All the world's a stage,
And all the men and women merely players
They have their exits and their entrances; — (William Shakespeare, As You Like It, 2/7)