An adverb that starts with e could be each or eagerly.
I am sorry, I don't completely understand, could you give me more infromation so that I can help.
Answer:
Metaphor
Explanation:
A metaphor is comparing two dissimilar things without the usage of "like" or "as".
The phrase "baby you're a firework" compares you to a firework without the use of like or as, so therefore, it's a metaphor.
