What are some literary devices in Romeo and Juliet act 3, scene 3? Please include the line number.

Literary devices in act 3 of Romeo and Juliet include hyperbole, or exaggeration, which Romeo employs to emphasize his horror at his banishment from Verona ("Thou cutt’st my head off with a golden ax"). Friar Laurence in turn uses a metaphor when he refers to philosophy as "armor" that can help protect Romeo from grief: "I'll give thee armor to keep off that word, / Adversity's sweet milk, philosophy, / To comfort thee, though thou art banished."

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This emotionally fraught and dramatic scene is filled with figurative language. Some examples are as follows:

Assonance is the repetition of same vowel at the beginning of words in close proximity, and consonance is the repetition of the same sounds within a word. This quote below uses both assonance and consonance in the repeated short "a" sounds, which bring a breathless feeling to the lines:

Affliction is enamoured of thy parts,
And thou art wedded to calamity.
The following uses anaphora, which is the repetition of the same word or words at the beginning of a line. This creates a pleasing sense of rhythm (note too the personification of sorrow):
What is the Prince’s doom?
What sorrow craves acquaintance at my hand
Anaphora appears again in:
More validity,
More honorable state, more courtship lives
In carrion flies than Romeo
The quote above also uses hyperbole or exaggeration when Romeo states that more truth, honor, and courtship exists in flies feeding on dead flesh than in himself. (Romeo is given to being a drama queen.)
Imagery, which is description using any of the five senses of sight, sound, touch, taste, and smell, along with hyperbole, can be seen in Romeo's statement to Friar Laurence:
Thou cutt’st my head off with a golden ax
And smilest upon the stroke that murders me
Romeo employs hyperbole again near the end of the scene. The statement below also uses antithesis, which is putting opposites together. In this case, the opposites are joy and lamentation:
With twenty hundred thousand times more joy
Than thou went’st forth in lamentation.
Friar Laurence also uses much antithesis. One example, said to Romeo as he berates him, is:
Thy dear love sworn but hollow perjury
Romeo uses imagery again when he states he won't hide himself:
unless the breath of heartsick groans,
Mistlike, infold me from the search of eyes.
Shakespeare never met a pun he didn't like, and two examples are below, with Shakespeare punning on flies as insects and flying as running, as well as mean as a way of doing something and mean as cruel:
Flies may do this, but I from this must fly.
...
No sudden mean of death, though ne'er so mean,
But “banishèd” to kill me?
The friar uses a simile when he compares Romeo's wit to gunpowder a clueless soldier sets on fire:
Thy wit, that ornament to shape and love,
Misshapen in the conduct of them both,
Like powder in a skill-less soldier’s flask,
Is set afire by thine own ignorance
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Romeo uses a metaphor to compare his punishment of banishment to a weapon that wounds him.  Speaking to Friar Lawrence, he says, 

How has thou the heart,
Being a divine, a ghostly confessor,
A sin absolver, and my friend professed,
To mangle me with that word "banished"? (3.3.51-54)

The word, itself, obviously has no physical power to "mangle" Romeo, but its effect on him is so strong and terrible -- because it means he must part from Juliet -- that he feels as though he does him physical injury.

Friar Lawrence uses metaphor in response: 

I'll give thee armor to keep off that word,
Adversity's sweet milk, philosophy,
To comfort thee, though thou art banished.

The friar thus compares those things that can comfort Romeo to an armor, something that wound protect him from the figurative physical wounds the word "banishment" inflicts.

Juliet's nurse uses alliteration when she calls their situation a "Piteous predicament!" with the repetition of the initial consonant "p" sound (3.3.94).

Romeo uses metonymy when he says, 

How is it with [Juliet]?
Doth not she think me an old murderer,
Now I have stained the childhood of our joy,
With blood removed but little from her own?

Romeo compares the newness and joy of their early stages of their love with childhood and the newness and joy of a child's life.  He substitutes "childhood" for "beginning," since childhood is the beginning of life.   

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Shakespeare's play, Romeo and Juliet, written in poetic verse, is replete with figurative language and literary devices.  In Act III, Scene 3, there are several literary devices at work:

Personification

Friar Laurence's opening words to Romeo give "Affliction" and "calamity" the qualities of a person as "Affliction" is in love and Romeo is married to "calamity":

Affliction is enamour’d of thy parts,
And thou art wedded to calamity. (ll.3-4)

And Romeo replies with personification:

What sorrow craves acquaintance at my hand (l.5)

For exile hath more terror in his look. (l.14)

Later, the friar speaks of

Adversity's sweet milk, philosophy (l.56)

Happiness courts thee in her best array (l. 148)

Figurative Language

Romeo speaks figuratively when he replies to Friar Laurence,

Calling death ‘banishment,’
Thou cut'st my head off with a golden axe
And smilest upon the stroke that murders me. (ll23-25)

Alliteration

In lines 10 and 12, the repetition of the initial consonant sounds of /d/ and /b/ are utilized:

What less than doomsday is the Prince's doom?

Not body's death, but body's banishment.

Then, in line 37, there is more alliteration as the /w/ is repeated

On the white wonder of dear Juliet's hand

And, in line 45, the /h/ is repeated:

Howling attends it.  How hast thou the heart

Hyperbole

Romeo's reaction to being informed that he is banished from Verona is expressed by him in exaggerated terms:

There is no world without Verona walls (l.18)

Metaphor

As Romeo speaks with the friar, Friar Laurence tells Romeo, using armor to mean courage, and comparing Romeo to a madman.

I'll give thee armor to keep off that word (l.55)

O, then I see that madmen have no ears. (l. 62)

The childhood of our joy (l.99)

The hateful mansion (l.113) 

[Romeo calls this part of his body where his name "lodges."]

Apostrophe

Friar Laurence reacts to Romeo's agitated state, addressing sin and ungratefulness,

Oh, deadly sin! Oh, rude unthankfulness! (l. 25)

Foreshadowing

Romeo uses the word grave, which foreshadows his death,

Taking the measure of an unmarked grave. (l.71)

Parallelism

Blubbering and weeping, weeping and blubbering (l.91)

Simile

But, like a misbhav'd and sullen wench,
Thou pout'st upon thy fortune and thy love.(ll.149-150)

Fie, fie, thou shamest thy shape, thy love, thy wit,
Which, like a usurer, abound'st in all, (ll128-129)

Calling death ‘banishment,’
Thou cut'st my head off with a golden axe
And smilest upon the stroke that murders me. (137-139)

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