Silence is a blank space that begs to be filled is and example of a metaphor.
A metaphor is a literary technique where one thing is compared to or called another thing that it is not literally. In this example silence is being called something that it isn't actually...a blank space that begs to be filled.
Irony is when the audience or reader knows something that the characters do not, and shows a difference between reality and appearance, simile is a comparison of two things that uses like or as, and hyperbole is an exaggeration made for effect.
