Always Shakespeare's plays are replete with literary devices, for figurative language is an integral part of the beauty of his lines. In Romeo and Juliet, especially, there is much contrast of light and shadow, a technique known as chiarosuro. In addition, the customary usage of simile and metaphor, along with personification and oxymoron and other literary devices are present.
In Act III, Scene 3 of the play, a desperate and distraught Romeo has fled the streets of Verona and seeks sanctuary in Friar Laurence's cell. Upon entering, he asks the priest what he has heard regarding his "doom," using alliteration [repetition of the /d/ ] in his line, "What less that Doomsday is the Prince's doom?" And, the friar's reply also has alliteration with /b/: "No body's death, but body's banishment."
Here are more examples of figurative language:
Oxymoron - "Oh, woeful sympathy!"
Alliteration - "On the white wonder of dear Juliet's hand" ; "This may flies do, But I from this must fly."
Personification - "A gentler judgment vanished from his lips"; "For exile hath more terror in his look,/Much more, than death."
Foreshadowing - "And fall upon the ground, as I do now,/Taking the measure of an unmade grave." [suggestion of Romeo's impending death.]
Pun - Oh, then I see that madmen have no ears" [pun on ears: Romeo does not hear the friar, and he turns a "deaf ear" to the advice of the priest]
Metaphor - "Adversity's sweet milk, philosophy"; "Thou cut'st my head off with a golden ax"; "My conceal'd lady to our cancelled love?" [concealed is a metaphor for secretly married]
Dramatic Irony - Without realizing, Romeo foretells his death in an "unmade grave," which he says before falling to the ground as the Nurse knocks.
Allusion - "But Purgatory, torture, Hell itself." [references to the life hereafter]
As if that name,
Shot from the dealy level of a gun,
Did murder her, as that name's cursed hand
Murdered her kinsman