Which technique does Dickinson use to make the ends of lines 1 and 2 sound similar

The first device used is called synesthesia. This device involves the use of one sense to describe another. For example, the breaths of the "watchers" are gathered, waiting for the last breath of the woman who lies dying

The other is called paronomasia which is another term for wordplay, a complicated way to used words in both obvious and subtle ways which may only be noticed by the most discerning reader. For example, the room where the woman is dying is very still, but the atmosphere is charged like the lull between the movements of a storm front