You don't really tell us what your topic is, but if you are looking for examples of the power of words in this section of the play, you could focus on the word "name". Romeo is hesitant to identify himself because he knows his "name" will cause problems for Juliet. She will recognize him as being of the despised Montague family. There are several exchanges between them in which they discuss the meaning of a "name" and the lack of importance of names. Juliet says:

'Tis but thy name that is my enemy;
Thou art thyself, though not a Montague

And then Romeo says:

By a name
I know not how to tell thee who I am:
My name, dear saint, is hateful to myself,
Because it is an enemy to thee

Some other powerful words in this section that have many metaphors and poetic devices associated with them are:

1. Love
2. Night
3. Marriage
4. Lark/vs nightingale