Romeo quotes that "Love is a smoke made with a fume of sighs being purged, a firing sparkling in a lovers eye." the reason why this is an example of a metaphor is because Romeo is comparing the love he has with Juliet with smoke which leads the reader into seeing the story is all about the endeavor with love.
Foreshadowing
Juliet uses a simile  where beautiful flower she saw that died due to the winter frost is now being compared to her death where she is going to kill herself with a dagger that'll remain there forever.
Pun
Romeo in the story compares Juliet to the sun and then uses personification to personify the moon to compare it to Juliet to describe how beautiful Juliet is.
Dramatic Irony
Juliet in Act 3 in the story foreshadows the future death of her lover by quoting "Methinks I see thee, now art so low, As one dead in the bottom of a tomb." she has a premonition where she sees Romeo dead.
One of the many puns displayed throughout the story is said by Mercutio were he makes a pun as he's dying which says he'll be a "grave man" tomorrow implying that his fate and death is inevitable.
One major instance of dramatic irony is when Romeo kills himself about seeing his dead lover in her grave whilst not knowing anything from any message or anything at all about Juliet's current condition.
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