Final answer:
In the literature excerpts provided, 'click' and 'tapping' serve as examples of onomatopoeia, imitating the sounds of a door knob turning and someone gently rapping, respectively.
Step-by-step explanation:
Onomatopoeia are words that sound like the object or actions they are describing. When we look at the excerpts provided, we can identify onomatopoeic words that evoke the sounds they represent. In the first passage, the word 'click' imitates the sound of a door knob being turned. In the second passage, the word 'tapping' mimics the sound of someone gently rapping on a surface.
These words function to create a vivid auditory impression for the reader, mimicking the actual sounds of the events being described and helping to bring the scenes to life in the reader’s imagination.